21 votes
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Can the Earth be seen from the moon when we have a total lunar eclipse at the perigee?

The Sun eclipsed by the Earth was actually recorded in 2009 by the Japanese lunar satellite Kaguya (athough this was strictly speaking not a total eclipse as such; see explanations below) Here the ...
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  • 2,304
16 votes
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How much longer is this (July 27th 2018) lunar eclipse than others?

The NASA has a lot of data on eclipses. I've pulled the table for the 21st century in Excel. There are 228 eclipses of which 85 are total. The durations below are for the totality phase. The duration ...
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  • 4,300
15 votes

What will a lunar eclipse look like from moon?

It would look like this (actual picture of the Earth, seen from the Moon, during a lunar eclipse): Link to full page: http://apod.nasa.gov/apod/ap140407.html The Earth would appear surrounded by a ...
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14 votes

Can the Earth be seen from the moon when we have a total lunar eclipse at the perigee?

Can the Earth be seen from the moon when we have a total lunar eclipse at the perigee? Yes - but primarily it's the Earth's atmosphere that you would see. Earth's atmosphere will refract and scatter ...
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11 votes
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Could there be an eclipse tomorrow if the Pleiades is covered by the Moon tonight?

Consider how far the pleiades are above the ecliptic, and how far the moon travels in a day. From this you can work the angle at which the moon must travel relative to the ecliptic, in order to cross ...
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  • 4,065
10 votes

What will a lunar eclipse look like from moon?

It would look like a solar eclipse! What happens is that Earth gets in the way between the Sun and the Moon. From Earth we see the Moon disappear, from the Moon one would see the Sun disappear. Earth ...
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10 votes

Why aren't there eclipses every month when the moon's orbit is aligned with the ecliptic as a result of lunar precession?

There are few things here I think might be worth to state: The tilt of Earth is of no importance here. As the comment says what is of importance how much the Moon orbit is inclined to the ecliptic. ...
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  • 1,248
9 votes

Which is more rare: Lunar eclipse or Solar eclipse?

Solar and lunar eclipses occur about equally often - between two and four times per year. However, when you do not intentionally travel around the world chasing solar eclipses, you are more likely to ...
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9 votes

How much longer is this (July 27th 2018) lunar eclipse than others?

The NASA NASA Five Millenium Catalog of Lunar Eclipse says that the longest total lunar eclipse was 106.6 minutes or 1 hr 46.6 minutes. The link for this century shows that the July 27th eclipse is ...
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  • 7,090
9 votes

Why doesn't the moon always follow the same path? Or why aren't the moon's apoapsis and periapsis fixed?

The Moon's orbit about the Earth is only approximately elliptical. The Moon's orbit precesses both axially and nodally, and the eccentricity of the Moon's orbit varies. That the Moon's orbit ...
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8 votes
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Red Moon a Characteristic of all Total Lunar Eclipses?

No, not all total lunar eclipses will turn the Moon deep red. Most of them do, but not all. If you were standing on the Moon during the eclipse, you'd see the Earth passing in front of, and obscuring,...
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8 votes
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Why aren't there eclipses every month when the moon's orbit is aligned with the ecliptic as a result of lunar precession?

The precession of the moon's orbital plane does not align it with the ecliptic plane. The angle between those two planes is approximately 5.14° (it varies by ~±0.15°, mostly due to perturbation by the ...
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7 votes

Can the Earth be seen from the moon when we have a total lunar eclipse at the perigee?

The Moon as seen from the Earth looks dark red during a total lunar eclipse — it doesn’t go completely black and disappear. That’s because it is still partly illuminated by sunlight refracted through ...
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7 votes

Do the Sun's rays get focused at or near the L1 Lagrangian point?

The Sun's rays don't get focused, by the Earth, at L1. The Earth can act as a gravitational lens and it does have a focal length of 15,375 AU, more than five hundred times the distance to Neptune. ...
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6 votes
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Will the UK be able to witness the tetrad in April 2014?

It is great that you have an interest in astronomy. Unfortunately, the UK will be on the wrong side of the Earth to see the lunar eclipse on April 15. If you you want to experiment with various ...
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6 votes

What’s an Earth-Sun-Moon eclipse called?

The Sun won't pass between the Earth and the Moon in the near future, because the Sun is so much further away from the Earth, than the Moon. When the three are nearly co-linear, either the Earth ...
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5 votes

Has anyone filmed a total lunar eclipse from the Moon's perspective?

What can you say but "Wow..." http://www.space.com/32245-total-solar-eclipse-video-dscovr.html "The moon's dark shadow travels across Earth's face in spectacular new views of Tuesday's (March 8) [...
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  • 1,114
5 votes

Terran eclipse?

As Wayfaring Stranger's answer says, during a lunar eclipse seen from Earth, an observer on the Moon would see a solar eclipse. Earth is about 4 times the apparent diameter of the Sun. You can see a ...
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5 votes
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Do the gases in the Earth's atmosphere affect the color of a lunar eclipse?

From the way you have formulated your question, it seems to me that you are aware of the light diffusive process named Rayleigh Scattering and why it explains the various tints and colours of the sky ...
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5 votes

How to read an eclipse chart?

'P' is the penumbra, the zone where the Earth blocks some, but not all, of the Sun's light from reaching the Moon. 'U' is the umbra, the zone where the Earth blocks all of the light from the Sun (see ...
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5 votes

What is the maximum possible separation between sun and moon in the earth sky for an eclipse to occur?

We'll need the angular diameter of the Sun: 31.6-32.7 arcminutes; the Moon's is between 29.3 and 34.1 arcminutes (found on Wikipedia). The solar eclipse case is 0 degrees; it can only be an eclipse ...
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5 votes
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Why doesn't the moon always follow the same path? Or why aren't the moon's apoapsis and periapsis fixed?

The moon's orbit is elliptical. This is what the moon's orbit looks like from above (A is the Earth, and C is moon, c is the orbit of the moon around the Earth) As you see with an eccentricity of 0....
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5 votes

What was the day of the week for the total lunar eclipse (saros 61) that occurred on April 14, 32 AD?

The eclipse took place on the 14th of April in the Julian Calendar. The 14th of April 32AD in the Julian Calendar was a Monday. 32 was a leap year starting on Tuesday. The confusion may be because ...
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4 votes
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Does earth's Umbra reach Sun-Earth L2?

The Lagrangian point $L_2$ is very close to the most distant point from Earth with an umbra. $L_2$ is like the radius of the Hill sphere at $r=a\sqrt[3]{\frac{m}{3M}}$ for circular orbits, with $m$ ...
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4 votes

Terran eclipse?

A lunar eclipse on earth is a solar eclipse on the moon. The earth takes up 2° of sky from the lunar surface (vs 0.5°), so you'd see less corona in your space suit. The moon's speed through earth's ...
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4 votes

Is it possible for a moon to only be out at night?

If the Earth were alone in space and the hypothetical moon had negligible mass, you can calculate the distance at which the period would be one year using: $$ a = \left( \frac{GM_E T^2} {4 \pi^2} \...
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4 votes
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Are Saros series separated by "40" in numbering related in any way?

It's been 3 years and I wondered if you found further answers on this. It's sad the answers here don't relate to your question. I too wanted to find this out. On the non overlapping, the 12 cycles are ...
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4 votes
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How to read an eclipse chart?

astrosnapper already explained the chart and the Us and Ps, so I'm going to focus on the map. The map shows you which phase of the eclipse is visible from where. For example Mauritius gets to see the ...
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4 votes

Moon’s orbit shift

It has increased in radius since the formation of the Earth-Moon system. There were eclipses since then. See Eclipse. Hyperphysics The only way you would not have (at least partial) eclipses is if ...
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3 votes

Calculating the date and year when a lunar eclipse will fall on the Winter Solstice

A university library in 1947 might have a copy of T. von Oppolzer, Canon der Finsternisse (1887), which lists those lunar eclipses on pages 368 and 374. A reader with a working knowledge of astronomy ...
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