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Aug
5
answered Astronomy questions I wondered for hours
Aug
5
comment Astronomy questions I wondered for hours
This question appears to be off-topic because it is about religion, not science.
Aug
5
comment Astronomy questions I wondered for hours
This site is about science, not religion.
Aug
5
comment Astronomy questions I wondered for hours
Please copy the question here. Links can die, and thus render this question unusable for future readers.
Aug
4
comment Apogalacticon and Perigalacticon
"Sag DEG is roughly 10,000 light-years in diameter, and is currently about 70,000 light-years from Earth" en.wikipedia.org/wiki/Sagittarius_Dwarf_Spheroidal_Galaxy . We are not part of it.
Aug
4
comment Can there be an infinity of stars in the Universe?
This is a known fallacy.
Aug
4
comment Determining planetary positions on the celestial sphere by Right Ascension and Declination
What do you exactly need? "Planetary positions on the celestial sphere" are one thing and "position[s] on our solar system" are another. The first is two-dimensional on a projected sphere and the second is three-dimensional.
Jul
31
answered Is the Hubble Ultra-Deep Field image representative of the entire sky?
Jul
25
answered How did the reionization epoch make the universe “transparent”?
Jul
24
comment Could dark matter particles be unstable?
en.wikipedia.org/wiki/Baryonic_dark_matter
Jul
24
comment Could dark matter particles be unstable?
@Aaron this is not how Dark Matter is defined in Astronomy, when we make rotation profiles for galaxies. Dark matter is ordunary matter, but just dark=unobservable.
Jul
23
revised Why can we sometimes see the moon during the day?
forgotten words
Jul
23
answered Are there standard algorithms and procedures for creating unique sky maps based on latitude/longitude/date/time?
Jul
18
answered Can Summer Triangle asterism be used for navigation?
Jul
17
comment The RA and Dec of lunar poles
@questionhang Just use Cassini's Laws. If you have trouble with them that's another question. This one is over.
Jul
17
comment The RA and Dec of lunar poles
@questionhang Double check the link I have just provided. The angle between the ecliptic and the lunar equator is always 1.543° and the rotation axis of the Moon precesses with the same rate as its orbital plane, but is 180° out of phase (see Cassini's Laws). This is all you need. You just need to follow the link to Cassini's Laws. Did you really investigate before asking?
Jul
16
comment The RA and Dec of lunar poles
@questionhang en.wikipedia.org/wiki/Orbit_of_the_Moon#Inclination
Jul
16
answered The RA and Dec of lunar poles
Jul
11
comment Why is right ascension measured in hours?
@Dieudonné No, you can not define a time unit as an angle, they are different magnitudes. You can, instead, define a time unit by using an angle: a sidereal second is the time the Earth rotates 360/(24*60*60) degrees in reference to the fixed stars in average.
Jul
10
comment What is the difference between a dwarf spheroidal galaxy and a globular cluster?
Please note that I referred to be bound inside a larger body. SMC and LMC are not inside Milky Way.