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My Astronomy Event Calendar:
http://calendar.yahoo.com/quarkcsj
Best viewed in Month view. Please select the Month tab after clicking link above.
Ever wonder just how often and how close comets and asteroids come to Earth?
Want to really be impressed? Check out the calendar for the previous month. Most Asteroids that pass close to Earth are discovered the day before or the day after thier closest approach to Earth and therefore dont get onto the calendar until late.
Definition of Terms:AU - Astronomical Unit - The mean distance from the Earth to the Sun or about 93 Million miles, or 149,597,871 kilometers.
So the distance from Earth to the Sun is 1.0 AU.
The distance from Earth to the Moon is 0.00256 AU, or 1 LD (Lunar Distance) or 384,401 km.
The Criteria I use for putting comets and asteroids on this calendar is:
Asteroids that come within 0.05 AU to Earth
Comets that come within 1.5 AU of Earth
Comets that come within 1.0 AU or ~1.5 AU of the Sun during Perihelion.
Near Earth Objects: NEOs are asteroids and comets with perihelion distance q less than 1.3 AU.
Potentially Hazardous Asteriods: Near Earth Asteroids that come within 0.05 AU or less of Earth.
Although most of the celestrial events on the calendar can be seen from anywhere, the local events I put on are for Hawaii, California, Arizona, New Mexico, Texas, Oklahoma, Colorado, Nebraska, respectively.
My Astronomy Event Calendar:
http://calendar.yahoo.com/quarkcsj
Best viewed in Month view. Please select the Month tab after clicking link above.
To give credit where credit is due, most of my information comes from these sources.
Space Calendar: http://www.jpl.nasa.gov/calendar/
Space Weather.com: http://www.spaceweather.com/
NEO Earth Close Approach Tables: http://neo.jpl.nasa.gov/neo/close.html
Eclipses: http://sunearth.gsfc.nasa.gov/eclipse/
Meteor Showers: http://www.qsl.net/dk3xt/metshw.htm
