46 votes

Can a lunar eclipse happen at night and be followed by a solar eclipse the next day?

No. A lunar eclipse occurs when the moon is on the opposite side of the Earth as the sun. A solar eclipse occurs when the moon is on the same side of the Earth as the sun. And it takes the moon 14 ...
James K's user avatar
  • 122k
45 votes
Accepted

Why is there a year 1 B.C., a year 0, and a year 1 A.D. in NASA’s Five Millennium Canon of Solar Eclipses?

This is all explained on the home page All dates are astronomical dates. These match CE (or AD) dates for positive values but differ by 1 for BCE dates. The Gregorian calendar is used for all dates ...
James K's user avatar
  • 122k
26 votes
Accepted

What caused pink flares during the eclipse

That would have been the so called 'solar prominences' i.e. eruptions of plasma on the surface of the Sun (see https://www.iflscience.com/next-months-total-solar-eclipse-could-come-with-bright-pink-...
Thomas's user avatar
  • 3,466
24 votes
Accepted

Earth is Tilted, but in reference to What Object / relative to what?

The orbit of the Earth around the Sun defines an orbital plane. The equator of the Earth is (currently) tilted at an angle of 23.4 degrees to this orbital plane. Or to put it another way, the spin-...
ProfRob's user avatar
  • 152k
17 votes

Why are the solar prominences visible during a total solar eclipse - orange? Is the sun orange?

There are several things going on here. Structures that are seen in emission off the photospheric limb of the Sun - know as prominences - are emitting a lot of light at the specific wavelength of the ...
ProfRob's user avatar
  • 152k
13 votes

At 45°N, how come the Sun rises in a northeasterly direction?

This is probably easiest to grasp by using some planetarium software (like Stellarium), and turn on the equatorial grid as in the images below (note the map distortion makes the "circles" ...
Greg Miller's user avatar
  • 5,867
11 votes

Can a lunar eclipse happen at night and be followed by a solar eclipse the next day?

Yes… if you're on Mars. Earth's Moon is far enough from Earth that its synodic orbital period (i.e. the time between two full moons or two new moons) is about 29.5 Earth days. The time between a full ...
Ilmari Karonen's user avatar
11 votes

Will Earth become a gas giant when the Sun expands in 5 billion years?

The opposite. The Earth orbits at 30 km/s. The Sun's material would not have comparable net rotation, so the Earth would be subjected to a 30 km/s wind. This wind would easily strip off the Earth's ...
Sten's user avatar
  • 4,644
11 votes

Why are the solar prominences visible during a total solar eclipse - orange? Is the sun orange?

And according to the pictures from NASA it looks like a solar prominence has the same color as the sun. Note the photo you've linked here is taken in UV, not visible light. The prominence and the ...
BowlOfRed's user avatar
  • 2,085
11 votes

Why are the solar prominences visible during a total solar eclipse - orange? Is the sun orange?

The surface of the sun is (roughly) a black body emitter. It emits light over a wide band from the ultraviolet to the infrared. When we see this light it appears "white". Its actually hard ...
James K's user avatar
  • 122k
7 votes

Why is there a year 1 B.C., a year 0, and a year 1 A.D. in NASA’s Five Millennium Canon of Solar Eclipses?

The concept of zero didn't reach western Europe until the 13th century. The concept of zero is a bit heretical (a thing that represents nothing???), but is arguably the most important concept in ...
David Hammen's user avatar
6 votes

What objects (if any) are there above or below the ecliptic, or just vaccum/gases

There isn't much of anything. Firstly, if you go a long way out you eventually reach other stars, and these are distributed all round the sun, most aren't on the ecliptic, and those that are close to ...
James K's user avatar
  • 122k
6 votes

At 45°N, how come the Sun rises in a northeasterly direction?

This should be fairly easy to understand from the following pictures. The sun is directly to the right in each one and the earth's orientation matches what it would be for the northern hemisphere ...
Kyle's user avatar
  • 161
6 votes

At 45°N, how come the Sun rises in a northeasterly direction?

This can be proven mathematically fairly easily, at least on a sphere and neglecting refraction. The algorithm can also be followed in Google Earth Pro with the "circle ruler" tool. Let us ...
Martin 'Kvík' Baláž's user avatar
5 votes

At 45°N, how come the Sun rises in a northeasterly direction?

The apparent position of the sun at sunrise (or sunset) is perpendicular to the terminator. I'm sure you've seen one of those world maps that shows the day/night areas over time and the seasons. On ...
Dave Tweed's user avatar
5 votes

At 45°N, how come the Sun rises in a northeasterly direction?

You cam see what's happening by using Google Maps. Zoom out until you see a lot of the world. Pick a point (left click) then right click and select measure distance. Right click somewhere on the ...
stretch's user avatar
  • 1,791
5 votes

The sun path angle of elevation

Yes, there is a reverse formula giving the elevation in terms of the azimuth, declination, and latitude, but it's a bit messy, so I won't write it out fully. That azimuth equation comes from the ...
PM 2Ring's user avatar
  • 14.5k
4 votes
Accepted

The sun path angle of elevation

The formula you provided is a straightforward solution of the spherical triangle with vertices at the North Pole, the location of the observer, and the geographical position of the Sun, using the law ...
stretch's user avatar
  • 1,791
4 votes

Why are the solar prominences visible during a total solar eclipse - orange? Is the sun orange?

The camera might be looking in the reddish-orange 656nm H-alpha emission line, but probably the telescope's solar filter is just orange instead of neutral-density. I had a solar filter that made ...
Miss_Understands's user avatar
4 votes
Accepted

How can I plot a rotary cam for the equation of time?

Following the video, the shape of the cam is a polar plot of the equation of time, with an offset to keep the values positive. You can use any of the trigonometric approximations to the equation of ...
James K's user avatar
  • 122k
4 votes
Accepted

What objects (if any) are there above or below the ecliptic, or just vaccum/gases

To clarify, rather than talking about where things are, it's more precise to talk about their orbits. Orbits are (to a first approximation) ellipses, and each ellipse lives on an infinite 2d plane. ...
ScienceSnake's user avatar
  • 1,002
2 votes

Is It Possible to See the Sun's Corona Appearing to Flare Out From Behind the Moon During a Total Solar Eclipse?

It all depends on the solar activity. Technically, we are actually now pretty much at the maximum of the 11 year acticity cycle. In 2017 we were about at the minimum. Usually you would expect a larger ...
Thomas's user avatar
  • 3,466
2 votes

Is It Possible to See the Sun's Corona Appearing to Flare Out From Behind the Moon During a Total Solar Eclipse?

Eclipses are not all exactly alike for a variety of reasons, largely because the corona is an active system and strongly influenced by what the sun's magnetic field is doing at any given time. Looking ...
Darth Pseudonym's user avatar
1 vote

What does the solar analemma on earth look like at the equator? Some web sources seem to indicate it is a horizontal line. How can that be?

There is already a correct answer, but I think it could be complemented by drawing the analemma at the equator, where we can see that it's axis is horizontal: Just for comparison, the analemma at ...
Pere's user avatar
  • 1,760
1 vote

If the Earth is rotating counter clockwise, how does the sun rise from east?

I have another experiment: Take your right hand (representing the earth) facing the back of your hand, so the thumb (left) is west and the little finger (right) is east (your middle finger is north, ...
U. Windl's user avatar
  • 273

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