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Results tagged with astronomy
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user 26834
The science dealing with objects and phenomena located beyond Earth. In particular, this applies to observations and data. At its core, astronomy is the physically informed cataloging and classifying of the contents of the universe in order to better understand what is out there.
1
vote
Accepted
How do I find the location of the vernal equinox?
The answer is here.
https://en.wikipedia.org/wiki/First_Point_of_Aries
There is also First Point of Libra.
- 1,300
1
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Sun's Right Ascension appears to be wrong in my Stellarium
Given we are less than a month away from the equinox, I guess Stellarium is right.
- 1,300
2
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How to practically find the RA-DEC coordinates of a star?
Many telescopes have computerised mounts, which once calibrated, will provide a direct readout of the RA and DEC of where the telescope is pointed
Another method is to take a photo (typically via a C …
- 1,300
0
votes
astronomy & light pollution
If you include car lights and similar in what is turned off, then in a big city such as London, which has a radius of about 10 miles, there would be very little light pollution, instantaneously. How …
- 1,300
0
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How we are able to see stars in night, even if they are light years away from earth?
If a star is, say, 4 light years away (eg alpha centauri), light from it takes 4 years to reach us. Stars are generally very bright, so they can be seen seen a long way away. That's all.
- 1,300
2
votes
How do we measure distance using parallax?
$\theta$ is half the difference in direction of 2 measurements of the position of the star taken 6 months apart.
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0
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Why is the moon not full?
The last full moon was on August 18. At full moon, the moon rises at pretty much the same time as the sun sets, so you won't see both in the sky at the same time. As you say the moon was about half …
- 1,300
1
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Why are Lunar Eclipse more common than Solar Eclipse?
The apparent size of the moon (from Earth) is about the same as the sun's. Therefore the moon has to pass over the sun's path at the time of the new moon for there to be a solar eclipse.
The apparen …
- 1,300
19
votes
How many minutes in a year?
4 minutes a day accumulates to 24.3 hours in a year - ie the time it takes for the earth to rotate once, more or less. This in essence is why the difference between the sidereal day and the solar day …
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