Reference
Information
Astronomy
Boats
Burgees
Celestial Navigation
Chandleries
Flags
Nav Rules
Navigation
Quick References
Racing
Radios
Tides & Currents
Time
US Coast Guard
US CG Auxiliary
Weather
Yacht Clubs
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Astronomy &
Celestial Navigation
Earth
Earth in Perspective
Sun
Sun Data for One Day
Sun Data for One Year
Eclipses of the Sun
Ephemeris resources for the Sun
Moon
Moon Data for One Day
Moon Data for One Year
Phase of the Moon Data
Eclipses of the Moon
Ephemeris resources for the Moon
Stars
Navigational Star Chart, Mercator
Navigational Star Chart, Polar
Summer Stars
Fall Stars
Winter Stars
Spring Stars
Locate Stars by Date and Time
Ephemeris resources for the Stars
Planets
Locate Planets by Date and Time
Ephemeris resources for the Planets
Astronomy Clubs
Los Angeles Astronomy Society
Texas Astronomy Society, Dallas
Astronomical League
Celestial Navigation
Altitude Corrections, All Bodies
Constellations by Name
Constellations by RA
Location of Selected Stars
RA to SHA & SHA to RA
The Sun & The Moon
The Sun is the most prominent feature in our solar system. It is the largest object and contains approximately 98% of the total solar system mass. The interior of the sun could hold over 1.3 million Earths. The Sun's outer visible layer is called the photosphere and has a temperature of 6,000°C (11,000°F). This layer has a mottled appearance due to the turbulent eruptions of energy at the surface.
The Moon is 384,403 kilometers (238,857 miles) distant from the Earth. Its diameter is 3,476 kilometers (2,160 miles). Both the rotation of the Moon and its revolution around Earth takes 27 days, 7 hours, and 43 minutes. This synchronous rotation is caused by an unsymmetrical distribution of mass in the Moon, which has allowed Earth's gravity to keep one lunar hemisphere permanently turned toward Earth.
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