Your Guide to the Solar Eclipse
A solar eclipse occurs when the Moon passes between the Earth and the Sun – a rare occurrence. Don’t miss your chance to watch celestial mechanics in action, on 20th March 2015, from 08:30 to 10:44.
Observers across the UK will be able to watch as the Moon’s orbit passes in front of the Sun. The transit of the Moon across the Sun will begin at 8:30am. As the eclipse reaches its maximum (90%) coverage at 9:35am, the sky will darken and the temperature will drop.
Although there will be more partial eclipses in the coming years, the next total eclipse viewable from the UK won’t happen until 2090. So there’s no excuse not to download our eclipse viewer (see below) and head outside on the 20th March to watch the eclipse as it happens.
The video (below) from SciShow Kids is a great introduction for young children on the mechanics of the solar eclipse.
What is a solar eclipse?
When we draw pictures of the Moon’s orbit around the Earth, and their orbit around the Sun, we tend to draw them flat – like the diagram below. Looking at that, you’d think the Moon would pass in front of the Sun every month. It doesn’t, because the diagram is over-simplified.
In reality, the Moon’s orbit around the Earth and the Earth’s around the Sun are inclined relative to each other by about 5°. The points where the two orbital planes meet are called lunar nodes, and solar eclipses only happen when a new Moon occurs near a lunar node.
There’s one other feature of the Solar System that makes solar eclipses possible: the Sun is 400x further from the Earth than the Moon, but it’s also 400x larger. So to us, standing on Earth, they appear to be the same size in the sky. This is a staggering coincidence, and we get to enjoy the spectacle of an eclipse only because of that accident of geometry.
Solar eclipses are regular and predictable, but because everything has to be in the right place simultaneously they’re also very rare. Experiencing one is astonishing.
The diagram shows how different parts of the planet experience a solar eclipse. The small area in the centre, in the track of the moon’s shadow across the Earth, is called the umbra. That’s where we experience a total solar eclipse. The more extended region to either side is called the penumbra: there, you’ll experience a partial solar eclipse.
So on 20th March, Newcastle is in the penumbra.
Different types of eclipse
“Partial solar eclipse Oct 23 2014 Minneapolis 5-36pm Ruen1” by Tomruen – Own work.
In the penumbra. You’re much more likely to see a partial eclipse than a total eclipse.
Next viewable from Newcastle:
21 August 2017
Want more eclipse information? We’ve got you covered.
- Time and Date have a handy eclipse calculator for Newcastle
- NASA keep an eclipse page up-to-date too
- The Royal Astronomical Society have a page of further information for schools and teachers
- Reading University are running a National Eclipse Weather Experiment – join in here
- ABC News have some nice animations in their report on the 1999 total solar eclipse (do check this works with your IT system before trying to show in your school!)
Watching the eclipse online