Below are Online Astronomy sites.
This site is an excellent
link to "Astronomy" magazine, Sky & Telescope and a U.K. Astro mag. and
more...Here is a web based astronomy magazine
"Astronomy Now".Vangelis's ALBEDO 0.39 (Everything you wanted to know about the Earth's
Astro-Statistics)
Maximum distance from the sun: 94 million 537 thousand
miles
Minimum distance from the sun: 91 million 377 thousand
miles
Mean distance from the sun: 92 million 957 thousand and 200
miles
Mean Orbital velocity: 66000 miles per hour
0rbital
eccentricity: 0.017
Obliquity of the ecliptic: 23 degrees 27 minutes 8.26
seconds
Length of the tropical year: equinox equinox 365.24
days
Lenght of the sidereal year: fixed star fixed star 365.26
days
Length of the mean solar day: 24 hours and 3 minutes and 56.5555
seconds at mean solar time
Length of the mean sidereal day: 23 hours and
56 minutes and 4.091 seconds at mean sederial time
Mass: 6600 milion
milion milion tons
Equatorial diameter: 7927 miles
Polar diameter:
7900 miles
Oblateness: one 298th
Density: 5.41
Mean surface
gravitational acceleration of the rotating earth: 32.174 feet per second per
second
Escape velocity: 7 miles per second
Albedo: 0.39 Albedo:
0.39 Albedo: 0.39 Albedo: 0.39 Albedo: 0.39 Albedo: 0.39 Albedo:
0.39
The Reflection Nebula
Very Cool, The Keyhole Nebula
Large Supernova
