An apsis (Greek á¼ÏÎ¯Ï, gen. á¼ÏÎ¯Î´Î¿Ï), plural apsides (pron.: /ËÃ¦psÉ¨diËz/; Greek: á¼ÏÎ¯Î´ÎµÏ), is the point of greatest or least distance of a body from one of the foci of its elliptical orbit. In modern celestial mechanics this focus is also the center of attraction, which is usually the center of mass of the system. Historically, in geocentric systems, apsides were measured from the center of the Earth.
As I was telling you in a post just a few days ago, there’s a supermoon on the rise, and it will reach us today, Saturday, on the 5th of May. It marks the period when the moon is closest to the Earth (perigee), and this period will coincide with a full moon, making it [...]
Supermoon comes on the 5th of May; why is it a ‘super’ Moon? Well, because the period when the Moon becomes full coincides with the Moon’s perigee – its closest approach to Earth. It could be a weekend to remember for amateur astronomers, especially considering that Venus will also be at its brightest these days, [...]
It’s March 19 ladies and gentlemen, so you should probably know by now about tonight’s supermoon; but what makes it so super ? Well, tonight’s full moon will almost coincide with the moon’s arrival at the perigee point – which makes it a supermoon ? Actually, the moon will be at a greater distance from [...]