A Once-in-a-Lifetime Eclipse Will Be Visible to Millions on Tuesday—Here’s How to See It

One of the night sky’s brightest stars will be eclipsed by the asteroid Leona late Monday into early Tuesday.

Millions of people around the world may be able to witness a rare eclipse on Tuesday, December 12. Betelgeuse, one of the biggest and brightest stars, will briefly disappear from the night sky as an asteroid passes in front of it to create a once-in-a-lifetime eclipse, according astronomer Gianluca Masi, founder of the Virtual Telescope Project.

Betelgeuse is a blazing red supergiant in the constellation Orion. A supergiant is the term given to stars nearing the end of their lives. They are the largest stars in the universe because they puff up and expand out into space in their old age, according to NASA. The large star will be eclipsed by the asteroid Leona, which orbits between Mars and Jupiter in the outer reaches of the main asteroid belt.

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December 9 and 10, 2023 Current Moon Phase for the Northern and Southern Hemispheres

You can use this link to go forward or backward in time for Moon phase information. If you are curious, you can even find out what phase the Moon was in when you or anyone else was born.

Source: MoonGiant.com

Northern Hemisphere

December 9, 2023

The Moon’s current phase for today and tonight is a Waning Crescent phase. This phase is best viewed just before the sunrise in the western sky. In this phase the Moon’s illumination is growing smaller each day until the New Moon. During this part of the Moon cycle, the Moon is getting closer to the Sun as viewed from Earth and the night side of the Moon is facing the Earth with only a small edge of the Moon being illuminated. It can also be a great time to see the features of the Moon’s surface. Along the edge where the illuminated portion meets the dark side, the craters and mountains cast long shadows making them easier to observe with a telescope or binoculars.

Visit the December 2023 Moon Phases Calendar to see all the daily moon phase for this month.

Today’s Waning Crescent Phase

The Waning Crescent on December 9 has an illumination of 13%. This is the percentage of the Moon illuminated by the Sun. The illumination is constantly changing and can vary up to 10% a day. On December 9 the Moon is 26.02 days old. This refers to how many days it has been since the last New Moon. It takes 29.53 days for the Moon to orbit the Earth and go through the lunar cycle of all 8 Moon phases.

Phase Details

Phase: Waning Crescent
Illumination: 13%
Moon Age: 26.02 days
Moon Angle: 0.50
Moon Distance: 394,836.24 km
Sun Angle: 0.54
Sun Distance: 147,332,225.49 km

The 8 Lunar Phases

There are 8 lunar phases the Moon goes through in its 29.53 days lunar cycle. The 4 major Moon phases are Full Moon, New Moon, First Quarter and Last Quarter. Between these major phases, there are 4 minor ones: the Waxing Crescent, Waxing Gibbous, Waning Gibbous and Waning Crescent. For more info on the Moon Cycle and on each phase check out Wikipedia Lunar Phase page.

Southern Hemisphere

10 December 2023

The Moon’s current phase for today and tonight is a Waning Crescent phase. This phase is best viewed just before the sunrise in the western sky. In this phase the Moon’s illumination is growing smaller each day until the New Moon. During this part of the Moon cycle, the Moon is getting closer to the Sun as viewed from Earth and the night side of the Moon is facing the Earth with only a small edge of the Moon being illuminated. It can also be a great time to see the features of the Moon’s surface. Along the edge where the illuminated portion meets the dark side, the craters and mountains cast long shadows making them easier to observe with a telescope or binoculars.

Visit the December 2023 Moon Phases Calendar to see all the daily moon phase for this month.

Today’s Waning Crescent Phase

The Waning Crescent on December 10 has an illumination of 7%. This is the percentage of the Moon illuminated by the Sun. The illumination is constantly changing and can vary up to 10% a day. On December 10 the Moon is 26.99 days old. This refers to how many days it has been since the last New Moon. It takes 29.53 days for the Moon to orbit the Earth and go through the lunar cycle of all 8 Moon phases.

Phase Details

Phase: Waning Crescent
Illumination: 7%
Moon Age: 26.99 days
Moon Angle: 0.51
Moon Distance: 390,436.04 km
Sun Angle: 0.54
Sun Distance: 147,314,094.05 km

Useful Moon Resources