Questions tagged [solar-eclipse]

Questions about the complete or partial blocking of the sun by the moon.

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159 views

Why can't we observe a solar eclipse and the preceding/following lunar eclipse from the same place?

Lunar and solar eclipses go in tandem so the two often happens two weeks apart. However I noticed if there is a solar eclipse in my area then the preceding/following lunar eclipse is not visible from ...
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939 views

Why are three year old eclipse glasses not recommended?

NASA's eclipse safety page says that eclipse glasses should: Not be used if they are older than three years, or have scratched or wrinkled lenses Why shouldn't three year old glasses be used? Is ...
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802 views

How rare are earth-like solar eclipses?

Solar eclipses on the earth are so spectacular because the moon has roughly the same size as the sun when viewed from the earth's surface. This is an incredible coincidence, and my guess is that it is ...
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536 views

How might Thales have predicted a solar eclipse?

Thales of Miletus purportedly predicted a solar eclipse (most likely the solar eclipse of May 28, 585 BCE). The historicity of Thales' prediction can't be verified with any certainty given the ...
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1answer
158 views

Does the sky darken proportionally during a partial solar eclipse?

During a solar eclipse, some of the visible area of the sun is obscured by the moon. The exact percentage varies with time and with the observer's location. My question is, does the sky darken by ...
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142 views

When will solar eclipses become lunar transits?

When will the moon be far enough away from the Earth that we would no longer consider it a 'solar eclipse', but rather a 'lunar transit' when the moon travels between the Earth and Sun?
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72 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 ...
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60 views

How accurate should sun\moon ephemeris be for calculating eclipses?

I am writing a program to simulate eclipses for about -2000 to 6000. My question is, how accurate does my ephemeris for the sun and moon have to be to get a decent accuracy for eclipses? I currently ...
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142 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 ...
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208 views

Eclipse Visible Light Not Dark as Expected

I live in a place where we weren't on the path of totality but were in the 90% range. I was expecting it to be a lot darker than it ended up being. What does it mean to be in the 90% range on this map?...
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312 views

Why isn't the moon dark in a solar eclipse?

In the following partial solar eclipse, the moon is "invisible" rather than being dark. By contrast, if someone stands between my view and the sun, they will appear as a dark figure instead of ...
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57 views

Can lunar occultation of Venus occur during solar eclipse?

Moon can occult Venus. Venus can transit across the solar disc. Moon can elipse Sun. Can all three celestial events occur at the same time - Moon is at front of Sun (partial eclipse is fine) and Venus ...
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2answers
187 views

Is it possible that a satellite creates a forever eclipse? [closed]

So, to add a bit of context, I’m doing the NaNoWriMo challenge, which consists of writing a novel of 50k words in one month. My whole idea is based around the following question: What would happen if ...
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121 views

Filters for solar eclipse and solar feature viewing

I have a Vixen ED100SF ED refracting telescope and 10x50 6.5 Bushnell Legend Porro Prism binoculars and would like to outfit both with filters for solar eclipse viewing. I gather the basic setup ...
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1answer
201 views

What is the large astronomical instrument shown in this 1918 eclipse expedition photo?

This nice video musing about (among other things) the US Naval Observatory's $3,500 expedition to Baker City or at least Baker County Oregon to observe the June 18, 1918 solar eclipse, there is a ...
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118 views

Is the diamond ring effect visible in a 40mm hydrogen alpha telescope?

I'm going to Nebraska for the 2017 eclipse, and am weighing my options. I'm considering whether to pack my 40mm Coronado PST or to make a Baader AstroSolar filter for my 66mm William Optics apo. I've ...
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112 views

2017 solar eclipse report

I'm writing a report about the solar eclipse happening over north America and was wondering why looking at a solar eclipse is worse than looking at the sun regularly. In addition what alternate ...
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272 views

Can you test solar eclipse glasses with a remote control?

By putting solar eclipse glasses directly between a remote control IR emitter and device receiver, could some unsafe glasses be detected? My guess is most fake glasses are just blocking visible light ...
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1answer
54 views

Would an extremely bright star produce same kind of shadow band effect as seen in solar eclipses just before totality?

This answer explains that the shimmering patterns seen on surfaces at the moment before totality of a solar eclipse are called shadow bands, and that the phenomenon is closely related to the twinkling ...
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1answer
142 views

Long term temperature effects of an eclipse

I was surprised to see a very measurable difference in temperature at my home during the recent solar eclipse. The temperature was about 93 degrees fahrenheit but dropped to around 86 degrees. It ...
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186 views

How can I tell if my solar glasses are up to ISO standards?

Like many, we bought solar glasses to view the eclipse, and are now in a strange place where we can't tell if they're safe or not. The big fuss seems to be about ISO 12312-2 compliance. Apparently ...
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1answer
190 views

Why solar eclipse paths are symmetrical?

Reading upon the eclipse of March 20, 2015, I stumbled upon this page: http://www.timeanddate.com/eclipse/list-solar.html. What caught my eye is that for each year there are two eclipses whose paths ...
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128 views

Stellarium software with DE431 for eclipse 10000 yrs ago

Hi I am a novice in the field of astronomy. I want to find out the dates for lunar and solar eclipse 9000-11000 yrs ago. I found out that Stellarium is based on VSOP87 which is recommended for 4000 ...
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Was NASA's 2007 attempt to see helions during a solar eclipse successful? What instruments were used?

This answer about Sun-grazing comets led me eventually to Wikipedia's Helion (meteoroid), which has a one-sentence long article: A Helion meteoroid is a meteoroid that arrives from the approximate ...
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Last possible total solar elipse in the Earth's history [duplicate]

So the Moon is drifting away from Earth by 3.8 cm a year due to tidal interactions. With the Moon slowly receding from Earth, there will come a time when it no longer has sufficient angular size to ...
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153 views

Back-predicting solar eclipses

I want to back-predict solar eclipses as part of a research project. My main goal is to obtain a list of all solar eclipses that took place over a tight grid (let's say of 100km by 100km) for the ...
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539 views

Where can I find a solar eclipse calendar compatible with Google Calendar?

For planning purposes it would be good to have a calendar of upcoming (at least some years) solar eclipses. The closest thing I've been able to find has too many other events in it to be useful. A ...
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1answer
185 views

Solar Eclipse: How it occurs

In relation to the image above, although the topic relates to math, how can I visualise the situation described in the final equation presented, i.e., the declinations, ascensions, solar and lunar ...
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657 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 ...
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92 views

Moon’s orbit shift

Has our moon’s orbit shifted since its formation? Has there been eclipses on the Earth since last ~4 billion years? In other words, was there a time when Moon's orbit was at an inclination to Earth's ...
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1answer
111 views

What would cause large jumps in brightness during a solar eclipse?

This question on Physics SE about apparent brightness during a solar eclipse has a log-scale graph of light intensity versus time. Parts of it are the shape I'd expect: a nearly-smooth curve going ...
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1answer
86 views

In this image, where would the antumbra be?

In this image where would the antumbra be?:
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1k views

Calculate eclipse days and duration of satellite

If a satellite is revolving in a GEO orbit, then what will be the eclipse duration for it? How to calculate when the satellite will enter the dark side of the Earth? Any formula or online tool would ...
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2answers
152 views

Where would be the absolute most logical place in USA to observe the total solar eclipse on August 21, 2017?

Cloudy weather would defeat the purpose so I am guessing that the western states would be more ideal due to greater chance of clear sky. Isolation would also be nice. At a camp site on or near a ...
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1answer
73 views

How to tell between annular and total eclipse (directly)?

An annular eclipse is similar to total eclipse except our Moon "apparently" appears smaller than the Sun, my question is since in both cases there will be a glowing ring forming... so how to tell them ...
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1answer
1k views

2017 Eclipse intersection with I-95

I am excited to see the 2017 eclipse in South Carolina and would like to understand where exactly the eclipse-path intersects I-95, so that I can plan a day-trip. I have approximated at roughly ...
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1answer
69 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 ...
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212 views

Can Astronauts Aboard ISS See the Shadow of The Moon on The Earth During an Eclipse?

I was wondering if the astronauts on the ISS are able to see the shadow from the moon on the earth at all during the eclipse.
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1answer
90 views

Will I be able to see the “Beads of Baily” at 99%+ totality?

Where I am (Vancouver, WA), the Sun will be 99%+ covered. Will I be able to see the "Beads of Baily" when the sun is 99%+ covered in my area ? Downtown Portland, OR is expected to be 99.4% (according ...
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353 views

Viewing 2017 Solar Eclipse - How important is it to be in the center(blue line)?

I'm viewing the 2017 Solar Eclipse in Graham County, NC. How important is it to be in the center(blue line)? It is almost entirely national forest there so it would be fairly easy to get to assuming ...
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1answer
133 views

Why does the eclipse in this video look annular?

In this article about the AS870 flight that flew through the umbra of the March 8-9 2016 solar eclipse, there is a link to a YouTube video showing the eclipse recored by a handheld camera in the cabin....
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1answer
88 views

How could eclipse happen on the same day in a different calendar? (45 AD)

According to the eclipse calculator I use (Alcyone), a partial eclipse 0.314 magnitude occurred August 1, 45 A.D. in Rome starting at 8:35am local time. This would seem to correspond to an eclipse ...
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97 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?
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66 views

Do all total solar eclipses have the ring of fire when observed from ground?

I was recording the phenomenon and then I soon realised that the ring of fire don't dissappear, is it because of the apparent size of the moon and sun as well as the relative distance so that every ...
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1answer
150 views

A real light source, or an artifact?

I was taking shots of the 2017 eclipse using my D7200 camera with a 1000 ND filter. As I was going through the pictures after downloading them to a pc, I noticed that there's what appears to be a tiny ...
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2answers
128 views

Reasoning questions on eclipses

why doesn't a solar eclipse occur in every new moon? I know one reason is the inclination of Earth's orbital plane. But is there another?
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172 views

evaluate solar eclipse Besselian elements? [closed]

I found this NASA website which says that to predict eclipse, we should solve the Besselian elements ..what does this mean, how can I solve for Besselian elements? Is there a numerical method? I need ...
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99 views

Why didn't it seem darker outside with 66% of the sun covered by the moon? [duplicate]

I live in Austin, TX where the eclipse on August 21, 2017 reached its maximum point with ~66% of the sun covered by the moon. Why didn't it seem any darker than a normal time with 0% eclipse?
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Will you be able to see the corona in a 90%+ partial eclipse? [duplicate]

I live in Champaign, Illinois (see map) and am planning to watch the August 21st solar eclipse. This community is within the 95% totality range, but not within the path of totality. Will I be able to ...
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445 views

Why does the path of the moon in an eclipse curve (relative to the sun)

Reviewing several simulations of the solar eclipse, it is apparent that the path of the moon relative to the sun curves. Using https://www.timeanddate.com/eclipse/in/usa/kansas-city?iso=20170821 for ...