There have been some ridiculous news stories over the so-called ‘Supermoon’ of 19th March 2011. Especially the irresponsible one by the Daily Mail suggesting the Tōhoku earthquake of 11th March was caused by it. The only noticeable difference here on Earth will be larger than average spring tides.
This is the text of a post I made in uk.games.video.misc which sums up the facts…
You wouldn’t really notice the difference between a perigee* and an apogee* Full Moon unless they were side by side in the sky.
The Moon is always its ‘usual’ size. Sometimes a little bigger, sometimes a little smaller. Occasionally perigee coincides closely with Full Moon which is what happened on Saturday.
The difference between the extremes is 14% but usually the Full Moon occurs somewhere between apogee and perigee so each Full Moon is only a small percentage different from the next.
In fact this month’s Full Moon was just 1.08% bigger than February’s. April’s Full Moon will be just 0.10% smaller. Impossible to spot the difference. The news articles fail to mention this though!
The only thing unusual about this month’s Full Moon was how close it was to perigee, this made it the largest Full Moon since 1993, but not really anything so extraordinary. The Moon goes through perigee once a month so it always reaches its maximum apparent size at some point in the month, it just might not be full.
The Moon always appears larger when it’s close to the horizon due to an optical illusion. The Moon Illusion. The eye is fooled into thinking it’s further away and you have familiar objects close by to compare size with (e.g. houses, trees).
* the Moon’s orbit isn’t circular, it’s an ellipse. Once a month it passes through perigee (closest to Earth) and apogee (furthest from Earth).
Here is an animation showing the exact point of Full Moon for all of 2011. Notice how the Full Moons of January to April are almost exactly the same size. They then slowly decrease in size over several months. There’s no way anyone will spot the difference from month to month. It also neatly shows the libration effects, where the Moon shows a slightly different face to us as it orbits the Earth. Simulated images are from Virtual Moon Atlas.
The apparent size of April’s Full Moon is only a tiny fraction smaller than March’s. To all intents and purposes another ‘Supermoon’. Will we see stupid headlines about that one? I doubt it.



I’m hopelessly addicted. I managed to pick this little gem of a game up completely free from the
Sonically and graphically it is very good indeed. Very apt little ditties play for each level, the graphics are crisp and the game controls perfectly. The game is brilliant for a quick blast as levels only take a couple of minutes and you will soon find yourself restarting again and again and before you know it tens of minutes have passed!
Why did nobody tell me the Fighting Fantasy books were available on iOS? I used to love these books written by Steve Jackson and Ian Livingstone in the 1980s.
You can alter text size and font but I notice that the line wrapping goes a bit wrong at some of the smaller fonts. There’s usually not much text per page so it’s not too bad to stick with the default size. There is a visual and audible page flicking effect as you move between pages which might be hiding some loading time, it’s pretty quick so it’s not too irritating but page turns aren’t instantaneous. I’ve hit one page bug where successfully fighting a rope failed to light up the next page button, luckily going back to the autosave fixed it, hopefully there aren’t any game breaking bugs.