Archive for the ‘Astronomy’ Category

A darker than usual morning at this time of year

Sunday, January 2nd, 2011

Going back to work on the 4th of January might be enough to darken anyone’s spirits, the mornings are dark enough, but come the 4th dawn will be even darker for us here in London. A partial eclipse will have the moon covering up the rising limb of the sun, the uncovered portion will still be below the horizon at sun-up (08:06am).

Seeing as it will almost certainly be too overcast to take photographs and I’ll have no clear view to the low horizon anyway, I’ve prepared some simulations of what you would see (or I would photograph) were conditions perfect (with no atmosphere glare either).

The start of the eclipse as you'll not see it from East London

The Sun will clear the horizon by 8:15, but a good portion of it will be eclipsed by the moon.

9am

Just as you’re starting work, the sun will be high enough to clear low roofs and trees, you might get to see a chunk missing from it if you’re outside or near a window.

But it’ll probably be too overcast.

All over
9:30, and the sun is definitely high enough to see now, but you’ve missed all the action.

It’s a shame hardly anyone in London will see this eclipse, because it’s one of the best London will see for a long time. The centre-line passes right though London, skirting the west-side of central park in East Ham, passing right over Ilford station and just clipping the eastern edge of Valentines Park.

A fun toy for working out where the eclipse is visible is this map from NASA. The next total solar eclipse visible from London isn’t until June 14, 2151, so armchair eclipse hunters have a bit of a wait.

Eclipse Images.

Saturday, August 2nd, 2008

Between gaps and breaks in the clouds I managed to record pretty much the whole eclipse. The filter I used gave a slight ghoating to the edge of the sun, making it look out of focus.

Eclipse 2008

Eclipse

Friday, August 1st, 2008

My luck held out and there were just enough gaps in the cloud to catch the start and maxima of the eclipse. It is pretty much solid cloud now, so I’m not going to see the moon leaving the sun.  I’ve taken about a dozen photographs of the progress of the moon across the sun – I’ll post them here when I’ve cropped and fiddled with them.

Solar Eclipse 2008

Thursday, July 31st, 2008

Today (if you are reading this in my tomorrow) or tomorrow (if you are reading this today) or at some point in the past (if you are reading this after tomorrow)
Scratch that – start again.

August 1st, 2008. Solar Eclipse. Moon passing in front of the sun, sky darkening, a bit like August 1999, except it will not get as dark (no totality visible from anywhere in the UK).

The NASA animation below shows a tiny black dot (in reality ~200km oval) shooting across the face of the earth – somewhere where this passes over is where you need to be to see a totally blacked out sun. At the time of maximum eclipse in London only ~12% of the sun will be occluded by the moon,the further north you live, the more of the sun will be occluded.

solar_eclipse_animate_2008-aug-01.gif

Seen from London, the edge of the moon will make contact with the sun at 9:33 AM (BST), maximum eclipse occurs at 10:18 and the whole show is over at 11:05 BST. There isn’t another Solar Eclipse visible from the UK until March 20th 2015.

That’s not all for the sky shows in August though. The Perseids Meteor Shower takes place between the 11th and 13th of the month – pick somewhere with dark skies and look up, predictions indicate this will be a good show.
There is also a partial eclipse of the Moon on the 16th August 2008. That’s when the Moon goes dark.On that date the moon is fairly low in the London sky and rising. It is only around 10 degrees above the horizon at maximum eclipse, so might be a challenge to see anyting unless you can get high up with a good clear view to the south east.

If you do plan to watch the solar eclipse do it safely.

Another view of the dark matter possible-detection

Tuesday, April 22nd, 2008

http://cosmicvariance.com/2008/04/21/guest-post-juan-collar-on-dark-matter-detection/

Summary – it’s good, but is it real? Could be many other things.