Author Archive

Did Jesus have a Beard?

Posted in Art, Beards, History, Uncategorized with tags , , , on September 20, 2016 by telescoper

I don’t often venture into matters religious via the medium of this blog, but I think I’ll make an exception in this case to address a question that must surely be of prime concern to theological scholars.

The question Did Jesus have a Beard? was provoked by this image which I saw on Twitter this morning:

jesus

This is the oldest known depiction of Jesus found in England, a Roman mosaic found at Hinton St Mary, which dates from around AD 350.

All the very old depictions of Jesus that I’m aware of show him clean-shaven. The oldest I have seen in person (in the Basilica San Vitale in Ravenna, Italy) shows him likewise beardless (he’s in the middle):

ravenna_005-627x364

 

Another famous depiction, in the Basillica of Sant’Apollinare Nuovo also in Ravenna, which is dated 520 AD) shows him in a series of scenes in which he appears beardless, but the final scene (of the Passion) shows him with the full beard that became the norm for later portraits and remains so up to the present day. This image is from the 6th Century AD and is very much in line with the we have come to assume Jesus looked like.

800px-spas_vsederzhitel_sinay

As far as I am aware, it doesn’t say anywhere in the Bible whether Jesus had a beard or not, so does the fact that the oldest known depictions show him clean-shaven mean that the real historical figure of Jesus didn’t have a beard?

Not necessarily. You have to remember that these early depictions were Roman, so it’s natural that they would have reflected the conventions of the culture at that time, not those of a different country (Judea) more than three centuries earlier. Being clean-shaven would have been regarded as a mark of nobility in Roman society, which probably explains why he was represented in that way.

I will probably get a deluge of corrections and clarifications from people who know a lot more than me about the early Christian church, so I’ll now step back and let the Comments Box do its work!

 

 

A test of Gaia Data Release 1 parallaxes: implications for the local distance scale [IMA]

Posted in The Universe and Stuff on September 19, 2016 by telescoper

One of the important cosmological issues that will be addressed by GAIA (which I blogged about last week) is the local distance scale, more precisely whether some modification to the calibration of Cepheid distances may be needed. This paper looks at this question using the GAIA DR1 results, and finds that – as yet – there isn’t any evidence of major problems, but it’s early days. The “tension” between “direct” estimates of the Hubble constant and those from Planck remains unresolved.

arxiver's avatararXiver

http://arxiv.org/abs/1609.05175

We present a comparison of Gaia Data Release 1 (DR1) parallaxes with photometric parallaxes for a sample of 212 Galactic Cepheids at a median distance of 2~kpc, and explore their implications on the distance scale and the local value of the Hubble constant H_0. The Cepheid distances are estimated from a recent calibration of the near-infrared Period-Luminosity P-L relation. The comparison is carried out in parallax space, where the DR1 parallax errors, with a median value of half the median parallax, are expected to be well-behaved. With the exception of one outlier, the DR1 parallaxes are in remarkably good global agreement with the predictions, and the published errors may be conservatively overestimated by about 20%. The parallaxes of 9 Cepheids brighter than G = 6 may be systematically underestimated, trigonometric parallaxes measured with the HST FGS for three of these objects confirm this trend. If interpreted as an independent…

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In case you haven’t heard what’s going on in Leicester …

Posted in Uncategorized on September 18, 2016 by telescoper

Here is some extremely worrying news about the Mathematics department at Leicester University. Reducing the number of research faculty to 15 in the way suggested is bound to have an extremely negative effect on morale and send the Department into a downward spiral. The University management must reconsider.

gowers's avatarGowers's Weblog

Strangely, this is my second post about Leicester in just a few months, but it’s about something a lot more depressing than the football team’s fairytale winning of the Premier League (but let me quickly offer my congratulations to them for winning their first Champions League match — I won’t offer advice about whether they are worth betting on to win that competition too). News has just filtered through to me that the mathematics department is facing compulsory redundancies.

The structure of the story is wearily familiar after what happened with USS pensions. The authorities declare that there is a financial crisis, and that painful changes are necessary. They offer a consultation. In the consultation their arguments appear to be thoroughly refuted. The refutation is then ignored and the changes go ahead.

Here is a brief summary of the painful changes that are proposed for the Leicester mathematics department. The…

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Cardiff: City of the Unexpected

Posted in Cardiff, Literature with tags , , on September 18, 2016 by telescoper

It’s been an extraordinary weekend in Cardiff as the city indulged in huge celebrations of the centenary of the birth of writer Roald Dahl, who was born in Llandaff.

I’ve been too busy with other things to see many of the events organised under the banner of City of the Unexpected, but to give you an idea of the scale here’s a shot of the crowds in front of Cardiff Castle watching the James and the Giant Peach episode.

image

The picture was taken by a member of the South Wales Fire service who were assisting at the event.

This happens also to be the welcome weekend for new students at Cardiff University, and I suspect many were a bit bemused by the goings-on!

It’s also worth mentioning that, as well as being a prolific author of children’s books, Road Dahl was the son of Norwegian immigrants. He was also a fighter pilot in the RAF during World War 2 who served with great distinction in North Africa and Greece, despite being seriously injured when his plane crashed while attempting to land.

Anyway, we’ll done to the organisers of this remarkable event which has put a big smile on the face of this great city.

Ninio’s Extinction Illusion

Posted in Uncategorized on September 17, 2016 by telescoper

This fascinating visual paradox has been doing the rounds on social media so I thought I’d share it here.

The twelve  black dots cannot be seen at the same time:

image

Reference: Ninio, J. and Stevens, K. A. (2000) Variations on the Hermann grid: an extinction illusion. Perception, 29, 1209-1217.

Verdi’s Macbeth at Welsh National Opera

Posted in Opera with tags , , , on September 16, 2016 by telescoper

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Last night I saw the new Welsh National Opera production of The Scottish Opera Macbeth by Giuseppe Verdi at the wonderful Wales Millennium Centre (above), resplendent in the sunshine of a late summer evening.

The original version of this opera was first performed in 1847, quite early in Verdi’s career, but was signicantly revised for a revival about twenty years later. Verdi’s two other Shakespeare-inspired operas, Falstaff and his masterpiece Otello, were written after a gap of about forty years after Macbeth, perhaps because Verdi discovered in Macbeth how difficult it is to adapt an entire play, especially one by Shakespeare, into an opera. The basic problem is that the text is far too long, so has to be drastically abridged to create a workable libretto. Macbeth is one of Shakespeare’s shorter plays in terms of word count, but it does have many changes of location. You can see the problems this posed for Verdi and his librettist Francesco Maria Piave, because the opera sometimes feels rather disjointed. Watching last night I sometimes felt that it was like watching the plot unfold on fast-forward. Another problem is that Macbeth is that many famous speeches have be truncated or cut out altogether. I’m quite familiar with the play, having studied it at school, but until last night had never seen the Opera, so it was a bit of disappointment to find Macbeth’s great soliloquy after the death of Lady Macbeth chopped to only a couple of lines. The same is the case with Lady Macbeth’s great speech upon the arrival of Duncan (“the Raven himself is hoarse…).

On the other hand, there is Verdi’s music, which provides a dramatic landscape of its own and smooths over some of the limitations imposed by the operatic form.

But enough of the problems with the Opera as compared to Shakespeare’s play and back to last night’s performance. This production had its first night last Saturday to relatively mixed reviews. I have to say that I thought it was superb. The action is set in the modern Scotland of a dystopian parallel universe, with a governing elite dressed in kilts and smart tweeds kept in power by armed paramilitaries in body armour, and assorted ruffians in shell suits and bobble hats. The Three Witches who prophesy that Macbeth is to be King are in this production actually three groups of seven or eight, each group having its own distinctive costume, their multiplicity producing a disturbingly scary effect. They also sang wonderfully, as did the rest of the truly outstanding Chorus of Welsh National Opera who were on blistering form.

wno-macbeth-wno-chorus-witches-photo-credit-richard-hubert-smith-9482

Members of the WNO Chorus as one of the three groups of Witches

Some reviewers found the staging unnecessarily brutal, which seems to me to be a rather silly view to take. This is Macbeth, not Mary Poppins! But in any case this isn’t the gorefest that I’ve seen in some theatrical versions of the play. In fact, the most bloodthirsty acts happen offstage. The exception is the assassination of Banquo who is stabbed and suffocated with plastic sheeting in front of the audience; his subsequent sudden appearance as a ghost in the famous banquet scene, his head still covered with bloody plastic, is accomplished with a smart piece of theatrical misdirection, and is startlingly effective.

When I read Macbeth at school it struck me that by far the most interesting character in the play was Lady Macbeth. Although her husband is a brave warrior on the battlefield he’s in many ways a bit of a drip. She has power over him and it is her that drives him on to his ultimate destruction. In this production Lady Macbeth (played by Mary Elizabeth Williams) is portrayed as a kind of cross between Imelda Marcos and Elena Ceaușescu (complete with a vast collection of fur coats and expensive shoes), the wife of a tyrannical leader unaware of the inevitability of his downfall. The staging of Acts III and IV plays on the obvious parallels with other historical dictatorships.

Mary Elizabeth Williams as Lady Macbeth dominated the first two acts of the play, her very fine voice (great power and lovely mezzo tones) matched by a powerful stage presence. That she overshadowed baritone Luis Cansino as Macbeth is not a criticism – I think it should be that way. Lady Macbeth does not appear at all in Act III and only once in Act IV when we see she has already lost the plot along with her marbles, sleepwalking and possessed by hallucinations. Soon after that, she dies (offstage), aand Macbeth himself surrenders to his fate at the hands of Macduff. At the very end, though, after his death aria, and just before the curtain falls, it is Fleance (the young son of the murdered Banquo and the future King) who cuts the throat of the dying Macbeth.

Anyway, if you have read the reviews of this production then don’t let them put you off. I thought it was a very provocative and interesting take on a familiar story and well worth going to see unless you only like your opera bland and formulaic.

Indian Summer, by Emily Dickinson

Posted in Poetry with tags , , on September 15, 2016 by telescoper

These are the days when birds come back,
A very few, a bird or two,
To take a backward look.

These are the days when skies put on
The old, old sophistries of June, —
A blue and gold mistake.

Oh, fraud that cannot cheat the bee,
Almost thy plausibility
Induces my belief,

Till ranks of seeds their witness bear,
And softly through the altered air
Hurries a timid leaf!

Oh, sacrament of summer days,
Oh, last communion in the haze,
Permit a child to join,

Thy sacred emblems to partake,
Thy consecrated bread to break,
Taste thine immortal wine!

by Emily Dickinson (1830-1886).

 

Eight Years In The Dark

Posted in Biographical with tags on September 15, 2016 by telescoper

8th-birthday-badge-pink
When I logged onto WordPress today  I received a message that it was the 8th anniversary of my registration with them as a blogger, which is when I took my first step into the blogosphere; that was way back on 15th September 2008. I actually wrote my first post that day too. Unfortunately I didn’t really know what I was doing on my first day at blogging – no change there, then –  and I didn’t actually manage to figure out how to publish this earth-shattering piece. It was only after I’d written my second post that I realized that the first one wasn’t actually visible to the general public because I hadn’t pressed the right buttons, so the two appear in the wrong order in my archive.

I’d like to take this opportunity to send my best wishes, and to thank, everyone who reads this blog, however occasionally. According to the WordPress stats, I’ve got readers from all round the world, including one in the Vatican! If you’re interested in statistics then, as of 14.00 BST today, I have published 3,343 blog posts, and have received 2,853,105 hits altogether; I get an average of about 1200 per day, but this varies in a very erratic fashion. The greatest number of hits I have received in a day is 8,864 (at the peak of the BICEP2 controversy). There have been 24,907 comments published on here and 1,556,259  rejected. Most of the rejected comments were from automated spam bots, but a small number have been removed for various violations, usually for abuse of some kind. Yes, I do get to decide what is published. It’s my blog!

While I am on the subject of comments, I’ll just repeat here my comments policy as stated on the home page of this blog:

Feel free to comment on any of the posts on this blog but comments may be moderated; anonymous comments and any considered by me to be abusive will not be accepted. I do not necessarily endorse, support, sanction, encourage, verify or agree with the opinions or statements of any information or other content in the comments on this site and do not in any way guarantee their accuracy or reliability.

It does mean a lot to me to know that there are people who find my ramblings interesting enough to look at, and sometimes even to come back for more, so I’d like to take this opportunity to send my best wishes to all those who follow this blog and especially those who take the trouble to comment on it in such interesting and unpredictable ways!

 

 

 

!Happy Birthday GW150914!

Posted in The Universe and Stuff with tags , , on September 14, 2016 by telescoper

A birthday message to the first gravitational wave source to be detected, from my new office mate, Bernard Schutz!

bfschutz's avatarThe Rumbling Universe

Just a year ago today, after travelling some 1.4 billion years, the gravitational wave chirp we christened GW150914 passed through Earth. It disturbed the two gravitational wave detectors of the LIGO observatory enough for us to notice it, to get excited about it, and to get a large fraction of the general public excited about it! But GW150914 just kept on going and is now one further year along in its journey through the Universe. And it will keep going, spreading out and getting weaker but not otherwise being much disturbed, forever. Literally forever.

And GW150914 hardly noticed us! When we observe the Universe with our telescopes, detecting light or radio waves or gamma rays from the enormous variety of luminous objects out there, we capture the energy that enters our telescopes. The photons from a distant star terminate their journeys in our telescopes, leaving a tiny hole in the…

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New: Top Ten Gaia Facts!

Posted in Astrohype, The Universe and Stuff with tags , , , on September 14, 2016 by telescoper

After today’s first release of data by the Gaia Mission, as a service to the community, for the edification of the public at large, and by popular demand, here is a list of Top Ten Gaia Facts.

Gaia looks nothing like the Herschel Space Observatory shown here.

Gaia looks nothing like the Herschel Space Observatory shown here.

 

  1. The correct pronunciation of GAIA is as in “gayer”. Please bear this in mind when reading any press articles about the mission.
  2. The GAIA spacecraft will orbit the Sun at the Second Lagrange Point, the only place in the Solar System where the  effects of cuts in the UK science budget can not be felt.
  3. The data processing challenges posed by GAIA are immense; the billions of astrometric measurements resulting from the mission will be analysed using the world’s biggest Excel Spreadsheet.
  4. To provide secure backup storage of the complete GAIA data set, the European Space Agency has commandeered the world’s entire stock of 3½ inch floppy disks.
  5. As well as measuring billions of star positions and velocities, GAIA is expected to discover thousands of new asteroids and the hiding place of Lord Lucan.
  6. GAIA can measure star positions to an accuracy of a few microarcseconds. That’s the angle subtended by a single pubic hair at a distance of 1000km.
  7. The precursor to GAIA was a satellite called Hipparcos, which is not how you spell Hipparchus.
  8. The BBC will be shortly be broadcasting a new 26-part TV series about GAIA. Entitled WOW! Gaia! That’s Soo Amaazing… it will be presented by Britain’s leading expert on astrometry, Professor Brian Cox.
  9. Er…
  10. That’s it.