Reputation
1,548
Next privilege 2,000 Rep.
Access moderator tools
Badges
4 19
Impact
~11k people reached

  • 0 posts edited
  • 0 helpful flags
  • 55 votes cast
Apr
29
awarded  Notable Question
Mar
17
comment Who discovered what set of factors is responsible for visibility of celestial bodies on Earth's daytime sky?
It's not an easy question. This set of factors is not really all that useful in astronomy (antithesis of optimal observation conditions), still if you asked for them, you'd probably have an answer or two. Asking for a person puts that one more level of separation from the main focus and really on the outskirts of the site's scope.
Mar
15
accepted Affordable night sky photography
Feb
4
awarded  Nice Question
Jan
27
awarded  Nice Question
Nov
28
awarded  Popular Question
Nov
27
awarded  Nice Question
Nov
21
accepted Is axial tilt direction correlated with semi-major axis direction?
Nov
21
accepted Appearance (frequency) ranking of stars?
Nov
21
asked Is axial tilt direction correlated with semi-major axis direction?
Nov
20
comment How does 67P rotate?
40 degrees - that suggests a pretty big "polar night" area. Now if we could get direction of the tilt relative to orbital semi-major axis (at what distance from the Sun equinox happens?)...
Nov
20
accepted How does 67P rotate?
Nov
20
asked How does 67P rotate?
Nov
16
accepted What are the metrics of observation conditions?
Oct
22
accepted What is the angular diameter of Earth as seen from the Moon?
Oct
21
comment What is the angular diameter of Earth as seen from the Moon?
@LocalFluff: Gives me a thousand results of angular size of the Moon as seen from Earth.
Oct
21
asked What is the angular diameter of Earth as seen from the Moon?
Oct
20
comment Are ascending node of sun, the point of intersection of prime meridian and equator and center of earth all collinear?
@barrycarter: In fact, I meant the momentary celestial equator for given equinox day - the moment when the point on Earth where the Sun is in zenith crosses the Earth's equator.
Oct
19
awarded  Revival
Oct
18
comment Are ascending node of sun, the point of intersection of prime meridian and equator and center of earth all collinear?
@barrycarter: Could you explain? The celestial equator is a great circle on the imaginary celestial sphere, in the same plane as the Earth's equator. That seems to imply they are always in sync, since one is defined by the other. Did you mean the ecliptic plane? In that case, it intersects the equator plane, and during equinoxes the intersection line happens to pass the Sun (or, if you nitpick at inexactness of the Ecliptic - the Sun passes the Earth equator plane twice a year.) At these moments Earth center, the Equator and the Sun are colinear, but the meridian is entirely random.