Calendar

Ascension

The Ascension Day of Jesus Christ always falls on a Thursday - it is the day when Christians celebrate the ascension of Jesus Christ into heaven as recorded in the […]

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 […]

Towel Day

Towel Day is an annual celebration on the 25th of May, as a tribute to the late author Douglas Adams (1952-2001). On that day, fans around the universe carry a towel […]

Memorial Day

Memorial Day is an American holiday, observed on the last Monday of May, honoring the men and women who died while serving in the U.S. military. Memorial Day 2021 will […]

World Bicycle Day.

In April 2018, the United Nations General Assembly declared June 3 as International World Bicycle Day. The resolution for World Bicycle Day recognizes "the uniqueness, longevity and versatility of the bicycle, which has been in use for two […]

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.

Live from the VOSS

Join Br. Guy Consolmagno, SJ and a few students from the 2023 Vatican Observatory Summer School. We'll discuss what brought them to Italy, what they've enjoyed most so far (besides the food) and what they hope to achieve in the future.

Official Calendar

2025 VO Calendar

Vatican Observatory 2025 astrophoto calendars now available for purchase in our e-store!