Venus Occultation by the Moon

Yesterday, May 16, 2010, the only astronomical event this year involving a major planet was witnessed by everyone in the Philippines - the occultation of Venus by the Moon. Or in English, the eclipsing of Venus by the Moon.

This event was particularly witnessed by the Asean Nations and as far as India. The view here in the Philippines was great and memorable that even non-astronomers - who for the most part takes the evening sky for granted - were looking up in the sky and taking pictures of the Moon and Venus before and after the occultation.

If I will take Sherlene's reaction as one of the possible reason why people are looking up in the sky, it was because the Moon and the Planet Venus looks like the Islamic Crescent Moon and Star. I agree, it does look like one! Particularly the flag of the Islamic Republic of Mauritania, a North African Nation!

Flag of the Islamic Republic of Mauritania
Venus occultation by the Moon

It was an experience to remember for all the Filipinos and Aseans who witnessed the event. Most of us takes the sky for granted, if you ask your friend to spot any planet, more likely than not they can not tell the difference between a star and a planet!

A special mention and congratulations goes to the Astrocamp Observatory at San Miguel By The Bay, Pasay City for introducing the Filipinos to astronomy. They've been there for one year already and yesterday's event was the first time I saw their observatory jam-packed not because of a popular astronomical event like solar eclipses rather because of an event that is usually only observed by astronomers.

You should visit them. If you use Stellarium or Celestia or any other astronomy application to view the sky, you are still missing a lot. The experience, the feeling, the closeness of seeing these objects up in the sky directly (with the help of telescopes of course) instead of photos and applications is far different. As far as the distance between Earth and the M31 Andromeda Galaxy, which is currently at 2.5 million lightyears.

(info: One lightyear is equal to 9.46 trillion kilometres / Julian year [One Julian year is equal to 365.25 days])


Did you know that the word "Moon" is actually the name of Earth's natural satellite? In 1665, it was extended to refer to the recently discovered natural satellites of other planets. However, to avoid confusion, all these objects were given distinct names. But non-astromers to this day still say, for example: "Phobos and Deimos are the two moons of Mars". The correct is: "Phobos and Deimos are the two (natural) satellites of Mars".

Because the "extended" meaning hasn't gone out of usage, "Moon" with a capital "M" refers exclusively to Earth's satellite, while "moon(s)" with a small letter "m" refers to a planet's "natural satellite(s)". And "Luna" is the Latin name, used commonly in fiction.

Update 2010-05-25: Thanks to stellasgaze for the mention on her blog . . the sky above . .! May 16, 2010 Lunar Occultation of Venus.

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