Calendar

New Moon

New Moon. By the modern definition, New Moon occurs when the Moon and Sun are at the same geocentric ecliptic longitude. The part of the Moon facing us is completely […]

Christmas Eve

Christmas Eve is on December 24 and marks the culmination of the Advent period before Christmas that starts on the fourth Sunday before Christmas Eve. Many churches mark the end […]

New Year’s Day

The year in the Roman calendar naturally starts on March 1. After all, the words September, October, November, and December literally mean Seventh Month, Eighth Month, Ninth Month, and Tenth […]

Full Moon

The Full Moon rises at sunset, and is visible all night. The Vatican Observatory's monthly Full Moon Meetup for Sacred Space Astronomy subscribers is held at 10:00 AM Tucson time.

Moon at Apogee

The Moon’s distance from Earth varies throughout its monthly orbit because the Moon’s orbit isn’t perfectly circular. Every month, the Moon’s eccentric orbit carries it to apogee – its most distant point from […]