Yes, two moons orbiting a planet can eclipse one another, but I think it would be difficult for the…
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Occultation of Mars by the Moon
The occultation video you point to looks completely normal, showing only a zoomed-in portion of the disk of the…

How Long Does a Full Moon Last?
Technically, the point at which the Moon is “full” lasts only an instant. To the naked eye, though, the…

Can One Measure Lunar Nodal Positions with a Sundial?
I can’t think of a way to measure the lunar nodal positions with a sundial. The Moon’s nodal points…

Shape and Orientation of the Third-Quarter Moon
The orientation of the illuminated portion of the Moon when it is at third quarter depends upon where on…
Are the American Flags Planted on the Moon by the Apollo Missions Bleached by the Sun?
Question: Hi, is it true that the flags put on the moon during the Apollo landings are now bleached…