Category: Schmidt-Cassegrain

Heavens Revealed

A long time ago, I used to take people on school trips. The comfortable chairs in the Greenwich Planetarium, elevated for skyward viewing, plus Heather Couper’s delectably seductive voice gently steering everyone through a year of constellations, is a fond, if hazy memory. Planetarium in the morning, plus waxy Astronomers Royal in fusty eighteenth century clothing peering into telescopes, followed by the National Maritime Museum or the Cutty Sark after lunch in the Park. 
Hamlet’s ‘brave, o’erhanging firmament’ has always held a certain wide-eyed fascination. As a jobbing physicist who has taught astrophysics as examination fodder, I know what a Cepheid variable is. I know about apparent and absolute magnitude. The fate of the Sun as it expands into a Red Giant – not a problem. As to being asked, off the cuff, where Betelgeuse is tonight, no clue. Not one.

Celestron Skymaster 25×70 binoculars

I had made up my mind that when I retired, I’d learn a bit more, principally because in the South light pollution is at a minimum and on clear nights the frosty ripple of the Milky Way is clearly visible and thousands of bright objects, some bluish, some red, keep watch during the night hours. Further north in Paris, the atmosphere is less forgiving but there’s still plenty to capture the imagination.
Turns out, astronomers were Internet junkies almost from its inception. There’s quite a body of astronomical knowledge out there and a very long observational history since people have been gazing heavenward in awe and wonder pretty much since we left off fraternising with the Neanderthals and struck out on our ownPtolemy of Alexandria lived 1900 years ago and his geocentric model of the Universe remained virtually unchallenged until Copernicus. My hero, for quite a number of reasons was the guy we always address by his first name, Galileo. Apart from standing up to the Pope – stout fellow for that – he was an observer of the heavens, which I am trying in some small way to become. Heeding the advice of seasoned astronomers, therefore, I have equipped myself with a decent pair of bins rather than a full-fledged Schmidt-Cassegrain telescope, since I’d like to get a bit of practice finding stuff before I waste a ton of money on the optics. A camera tripod completes the setup, for now, since holding a pair of 25×70’s still is a near-impossibility.
Tonight, I’m hoping the clouds roll away to reveal Jupiter who will  be in “full moon” phase when it ( or is it ‘he’)reaches closest opposition tonight, a mere eight hundred and fifty million kilometres away, rising east-north-east and remaining visible all night until setting around sunrise, exactly like a full moon. As I write, he’s there, peeping shyly out from behind the neighbours’ winter trees with moons trailing behind in a line, like the tail of a kite.
Just at sunset, facing the other way, Venus is bright in the southwestern sky, fading Mars a little higher and more to the west. Perhaps I‘ll catch a glimpse as she settles down behind the tree-line.

Winter moon with Jupiter, 2008 (naked eye)

The Universe is a panorama in space and time. The brightest star in the sky is Sirius, barely visible amid atmospheric pollution at this early hour tonight on the southeastern horizon and just over eight light years away. We see her as she was, eight years ago. Most of what we see and beyond vision is aeons older; of the three brightly diagonal stars in Orion’s Belt, the middle one is twice as far away than either of its neighbours, the light from it left it a few years after the Resurrection. I found it interesting that in M42 – the nebula in Orions’ Sword, just visible with the naked eye – still has unnamed stars in it. Fascinating.
The ancients believed that the firmament was a blanket covering the Earth at night. Imperfections in the blanket produced starlight, where the light of Heaven shone through.
Stargazing has a habit of bringing one down to size – the vastness of space, extending almost fourteen billion light years is, in some small way, comprehensible by a life form made of twisted nucleic acid and protein with the capacity to wonder at it.