[HN Gopher] Is it possible for a lunar eclipse to occur before s...
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Is it possible for a lunar eclipse to occur before sunset?
Author : georgecmu
Score : 59 points
Date : 2023-01-05 19:34 UTC (3 hours ago)
(HTM) web link (astronomy.stackexchange.com)
(TXT) w3m dump (astronomy.stackexchange.com)
| IncRnd wrote:
| Yes, a selenelion will happen just before sunset or just after
| sunrise when the sun and moon are at opposite points of the
| horizon. This is also called a horizontal eclipse and is due to
| the atmosphere not the planet. [1] [2]
|
| [1] https://sciencenotes.org/selenelion-eclipse/
|
| [2] https://www.space.com/27338-total-lunar-eclipse-rare-
| sunrise...
| JEDI-HACKER wrote:
| Yes always possible. If you consider the light spectrum is split
| during sun set and rise. So you will get more red light spectrum,
| during set/rise. You will see more green during night ie Nothern
| lights. And obviously mostly blue during the day.
| jjtheblunt wrote:
| i just realized you explained the red dawn and red dusk in
| Arizona, far more scientifically than the urban legend that
| it's "pollution from California".
| Taniwha wrote:
| A lunar eclipse can happen at any time of the day, might only be
| visible on the other side of the planet - maybe the question he
| meant to ask was "can you see ...."
| jojobas wrote:
| Every lunar eclipse happens at every possible time of the day,
| simultaneously.
| supernova87a wrote:
| It is possible (atmospheric effects as stated by others/the
| article), but not in a useful sense of having something that
| looks impressively like a lunar eclipse.
|
| In other trivia, expect that a solar eclipse will also happen
| somewhere on Earth in any month that has a lunar eclipse.
| (exactly because of similar alignment issues)
| [deleted]
| gweinberg wrote:
| Isn't that only true the other way around? The earth is bigger
| than the moon, so I'd think sometimes you'd get a total lunar
| eclipse when there's only a partial corresponding solar
| eclipse, and diddly when there's only a partial lunar eclipse.
| [deleted]
| codetrotter wrote:
| [flagged]
| mendelab wrote:
| Technically correct, but misses the point :)
| codetrotter wrote:
| [flagged]
| codetrotter wrote:
| [flagged]
| jefftk wrote:
| Wikipedia has a picture from 2014:
| https://en.wikipedia.org/wiki/File:Lunar_eclipse_at_sunrise_...
|
| Here's a nice post thinking through how you might actually
| observe this: https://photoephemeris.com/articles/the-selenelion-
| challenge
| yuliyp wrote:
| Sunset is kind of a fluid thing. The lunar eclipse on May 15 last
| year happened right around sunset as viewed in the SF bay area. A
| little way further south or west would have been an even brighter
| sky for the eclipse. https://photos.app.goo.gl/pjbefmFcv2THZEQ19
| are a few photos I took of this. The red of the eclipse was
| initially almost invisible due to how much light there still was
| in the sky, and it only became clearer as the ambient light
| diminished.
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