Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [lunar-eclipse]

Questions regarding an event where the Earth goes between the Sun and the Moon and casts a shadow on the Moon.

1
vote
1answer
38 views

Eclipse Changes Directions?

How could the lunar eclipse of January 20, 2019 begin from bottom to top and then finish from left to right? Here's the video of it's progression's directions. https://www.youtube.com/watch?v=...
-1
votes
1answer
25 views

Do clouds on earth have an affect on a blood moon to the naked eye? [closed]

I was watching the blood moon with a perfectly clear night- using only my naked eyes. At such a micro level, is it possible that all the shimmer I saw was an artefact of our atmosphere or just my poor ...
1
vote
0answers
28 views

What should be the seperation between sun and moon during a solar and lunar eclipse as viewed from earth?

I saw this code online where a guy calculates the separation between sun and moon and verify the occurrence of eclipses. You can find the codes here. Why does he uses earth's angular size seen from ...
4
votes
1answer
48 views

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

How do we calculate the maximum angular separation between sun and moon during: Solar Eclipse Lunar Eclipse
5
votes
0answers
36 views

What is the relation between the saros (18 years, 11 days, 8 hours) and the period of lunar nodal precession (18.6 years)?

I am wondering. I am sure that they are related. How can we derive one from the other?
1
vote
0answers
28 views

Lunar illumination (percentage) data on an eclipse day needed

I am looking for the information on the percentage illumination of the moon during the different stages of a total lunar eclipse. Is there a database from where I can acquire information of lunar ...
3
votes
1answer
75 views

Apollo 11 Under Different conditions

Howdy, this might be an odd question, but I'm using whatever information I gather here to help write an alternate universe version of the 1950s through 1980s. Due to some convoluted plot contrivance ...
0
votes
1answer
66 views

Solar series 142 and 147 started same year - series 147 and 152 will be ending same year. Why? Coincidence?

This question was left over from the last question I had, so I am asking it separately here: I have been looking into two solar eclipses (Saros series 147 and 152) that will both be occurring in 2021....
0
votes
1answer
57 views

What is a “semester series” for eclipse prediction? - Solar saros series 147 and 152

Yet again, I just stumbled across another baffling eclipse question (actually, two now). I was interested in two eclipses (Saros series 147 and 152) that will both be occurring in 2021. Each of these ...
2
votes
1answer
61 views

What irradiance does the Moon receive during a total lunar eclipse?

As we know, the total solar irradiance normally received by the Moon is about 1361 $W/m^2$ (the same as the top of the Earth's atmosphere). Of course, this changes during lunar eclipses, but the Moon ...
4
votes
2answers
66 views

How to read an eclipse chart?

NASA has a page dedicated to lunar eclipses and provides charts. How are these charts to be read? What do P1, P4, U1,... mean? What about the world map below? Click for full size view
4
votes
1answer
89 views

Why was the July 27th 2018 lunar eclipse not visible in North America?

I was just wondering if it had anything to do with the fact that last year we were blessed with the opportunity to see the total solar eclipse in our neck of the woods. So this is the universe's way ...
11
votes
2answers
693 views

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

According to the BBC the lunar eclipse on July 27th/28th 2018 is the "longest this century". Longest isn't a very good way of describing things, since it's a relative measure without reference to ...
3
votes
0answers
100 views

Are Saros series separated by “40” in numbering related in any way?

Can anyone help with this question? My question arose from an eclipse related observation that I made while looking into lunar Saros series 129. It is the Saros series number for the lunar eclipse ...
6
votes
2answers
118 views

Are red moons possible without eclipses or smoke from fires?

This morning I was on the bus and as I looked out of the window I saw that the moon was larger than usual and red. I live in eastern Norway and it was about -20ºF / 30ºC outside. There's no forest ...
3
votes
1answer
111 views

Do the gases in the Earth's atmosphere affect the color of a lunar eclipse?

As the sun's rays pass through the Earth's atmosphere only the red light gets through. Is this the result of specific gases in the Earth's atmosphere filtering the red light? Does all of the nitrogen ...
2
votes
2answers
101 views

Apparent size of the super blue blood moon

Is it normal that super blue blood moon is much smaller than before the eclipse? If so, why? I'm quite positive it's not cloudy here. On my TV, they broadcast a live super blue blood moon from the 4th ...
2
votes
0answers
58 views

How do I measure occultation for the upcoming lunar eclipse?

I'm trying to simulate the lunar eclipse on Jan. 31, similar to this simulation I made of last year's solar eclipse, using Three.js. I have the minute-by-minute coordinates for the Sun and the Moon in ...
2
votes
1answer
60 views

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

(For the sake of this question, let's assume that all other factors are malleable.) Essentially creating a permanent lunar eclipse, could a moon orbit around a planet so slowly that it is always ...
0
votes
1answer
705 views

What would be the required conditions for a lunar eclipse to occur only once on a precise annual basis?

As I am aware, lunar eclipses can take place several times a year on Earth. However, I am curious whether it would be possible for this event to only occur once annually on a specific date (and ...
1
vote
1answer
66 views

What prevents consequent eclipses? [duplicate]

I know there are a number of parameters that determine the occurrence of a solar or lunar eclipse. The number should be 18; 6 degrees of freedom for 3 rigid bodies. But can't figure out why eclipses ...
1
vote
1answer
85 views

Blood Moon Identification in NASA reports [duplicate]

Often I look at NASA's Eclipse Web Site. More specifically, I often look at the Index to Five Millennium Catalog of Lunar Eclipse. How can I tell if an eclipse results in a "blood moon"? I know not ...
0
votes
1answer
71 views

Partial Blood Moon

Is it possible for a partial lunar eclipse to be a 2 on the Danjon scale? If so, is it possible for this lunar eclipse to have been a 2 on the scale?
1
vote
2answers
560 views

Terran eclipse?

Solar and lunar eclipses are pretty straightforward. But what about eclipses when you are standing on the Moon? I have been trying to Google the info, but there's some gaming clan that has taken the ...
1
vote
1answer
133 views

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

I am a novelist working on a new book, titled Werewolves In The Christmas City, which happens to be Bethlehem, Pa. In 2010 when I was working on a book titled The Christmas City Vampire, a lunar ...
0
votes
1answer
75 views

Lunar Eclipse - Total darkness?

Can a lunar eclipse completely 'turn off' the mooon, i.e. like a New Moon? Or is it always just a 'shading' of the moon (sometimes red in color)?
-4
votes
1answer
70 views

Does Earth transit look like a black dot surrounded by red light?

As we know, lunar eclipse appear red, if we can see Earth transit from Mars, does it look like a black dot surrounded by red light on the sun?
1
vote
1answer
65 views

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

With all of the footage we have of total lunar eclipses, has NASA, ESA, or any other space program ever taken a photo or video of it from the Moon itself?
8
votes
3answers
195 views

Eclipse Cycle Calculations Needed

I am writing a work of fiction about a world where: The length of a year is 335 days. The world has two Moons. Moon A is Larger and further away with a 78 day lunar orbit. Moon B is smaller and ...
2
votes
1answer
157 views

Does earth's Umbra reach Sun-Earth L2?

Moon can be fully eclipsed by the virtue of being fairly close to Earth. Any body distant enough will not be eclipsed fully, Earth's disc not fully covering Sun's disc. How's that for anything at the ...
0
votes
1answer
121 views

Eclipse — Solar and Lunar

Q. Why is solar and lunar eclipse not seen from all parts of the earth at the same time? I think its because of the revolution of the earth but i am not sure. I want a more reliable answer.
2
votes
0answers
85 views

Illusion of a lunar eclipse [closed]

A little over half a year ago, I think it was mid March 2015, I glanced out of my window at about 4 am, to see what appeared to be a very bright total lunar eclipse, as in, the moon was full and ...
2
votes
1answer
111 views

Can we know where (South, East, West…) the moon will be at a specific time?

Apparently, a few nights from now (more specifically on the night between the 27th and 28th of September this year, nights being Belgian nights), we will have a lunar eclipse. That's great, and I ...
3
votes
1answer
529 views

Supermoon Lunar Eclipse?

I recently read this article: http://www.cbsnews.com/news/supermoon-lunar-eclipse-coming-this-month/ I'm having some trouble understanding how a "supermoon" lunar eclipse is possible. Judging from ...
1
vote
1answer
86 views

Eclipse on the moon

What kinds of eclipse is seen by the person on the moon, when there is: Solar eclipse on the earth, and Lunar eclipse on the earth?
5
votes
4answers
2k views

Which is more rare: Lunar eclipse or Solar eclipse?

Which is more rare: Lunar eclipse or Solar eclipse? Please explain why either one is more rare than the other. Thank you in advance for your inputs.
3
votes
1answer
63 views

.2015: When last did both New/Full moon in a fort-night cause an Eclipse?

Going through http://earthsky.org/…/dates-of-next-lunar-and-solar-eclipses I made the (what was for me - momentous) discovery that March 20, 2015 - New moon - is a Solar Eclipse, and that the ...
5
votes
2answers
310 views

Solar Eclipses for dummies: Step 1 - moon equatorial orbit around a planet without axial tilt

Note 1: I've studied downvoted questions and decided that I either asked too many questions or I sound like I'm setting a fantasy world. So I'm editing my question accordingly. Note 2: I'm a ...
0
votes
1answer
171 views

Multiple apparent lunar eclipses last night

I saw something very strange last night that I'm hoping someone can help me explain. I was sitting on my roof with a night-cap at about 3am last night. The moon, about the last quarter, was low in the ...
13
votes
5answers
1k views

What will a lunar eclipse look like from moon?

What will a lunar eclipse look like from moon? Will earth become a completely dark circle?
9
votes
3answers
566 views

Red Moon a Characteristic of all Total Lunar Eclipses?

I understand that the redness of the moon during the total lunar eclipse last night/this morning (April 14-15 2014) is a reflection of the red light caused in earth's atmosphere due to Rayleigh ...
5
votes
1answer
134 views

Will the UK be able to witness the tetrad in April 2014?

I live in the UK and am aged 15. I have become extremely interested in astronomy, astrophysics, the lot. Basically I have never seen a tetrad and believe this will be my first time - at least ...
8
votes
1answer
3k views

Why does the darkening of the Moon go from left-to-right during an eclipse?

In anticipation of the upcoming April 2014 lunar eclipse, I decided to use the 3D virtual planetarium software Stellarium to simulate what it is supposed look like where I live, since I've never ...
19
votes
2answers
36k views

What is the formula to predict lunar and solar eclipses accurately?

A number of ancient civilizations had devised methods to predict exact dates and times of such eclipses, marking them as important events. Hence I assume the predictions were based on calculations, ...