Penumbral Lunar Eclipse -

January 10, 2020

A penumbral eclipse of the Moon will occur on Friday, January 10, 2020 UT, lasting from 17:07–21:12 UT. It will be the first of four penumbral lunar eclipses in 2020. At maximum eclipse, 90% of the Moon’s disc will be partially shaded by the Earth, which will cause a slight shadow gradient across its disc; this subtle effect may be visible to careful observers. No part of the Moon will be in complete shadow.

What is a Penumbral Lunar Eclipse?

A penumbral lunar eclipse takes place when the Moon moves through the faint, outer part of Earth’s shadow. This type of eclipse is often mistaken for a normal Full Moon. The Moon shines because its surface reflects the Sun’s rays. A lunar eclipse happens when the Earth comes between the Sun and the Moon and blocks some or all of the Sun’s light from reaching the Moon.

Imperfect Alignment

A penumbral lunar eclipse occurs when the Sun, Earth, and the Moon are imperfectly aligned. When this happens, the Earth blocks some of the Sun’s light from directly reaching the Moon’s surface and covers all or part of the Moon with the outer part of its shadow, also known as the penumbra. Since the penumbra is much fainter than the dark core of the Earth’s shadow, the umbra, a penumbral eclipse of the Moon is often difficult to tell apart from a normal Full Moon.

Two Conditions

Two celestial events must happen at the same time for a penumbral lunar eclipse to occur:

The Moon must be in the Full Moon phase.
The Sun, Earth, and Moon must be nearly aligned, but not as closely aligned as during a partial eclipse.

Not Every Full Moon Night

The reason we do not see a lunar eclipse every Full Moon night has to do with the inclination of the Moon’s orbital path. The plane of the Moon’s orbit around the Earth is inclined at an angle of 5° to the Earth’s orbital plane around the Sun, the ecliptic. The points where the two orbital planes meet are called lunar nodes. Lunar eclipses can only take place when a Full Moon occurs near a node.

WHEN AND WHERE TO SEE

The eclipse will last 4 hours and 5 minutes overall, and will be visible from Africa, Europe, Asia, Alaska, and Australia.

The timings of the eclipse are as follows. You will be able to see the eclipse if the Moon is up as seen from your location; but note that this penumbral eclipse will be very difficult to see in practice:

Event	UTC Time	Time in New Delhi*	Visible in New Delhi
Penumbral Eclipse begins	10 Jan, 17:07:44	10 Jan, 22:37:44	Yes
Maximum Eclipse	10 Jan, 19:10:02	11 Jan, 00:40:02	Yes
Penumbral Eclipse ends	10 Jan, 21:12:19	11 Jan, 02:42:19	Yes

During this eclipse the Moon will be just 3 days before perigee, making it relatively large. At maximum eclipse it will be 0.545° in apparent diameter, which is 2.6% larger than average.

PRECAUTIONS TO BE TAKEN

There are no precautions you need to take when observing a lunar eclipse, since the moon is never bright enough to hurt our eyes like the sun is. A blood moon is one of the few opportunities we have to see both the moon and the stars in the sky at the same time, since the moon is usually too bright.

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