General astronomy

General astronomy

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General astronomy

sidereal year

Astronomy; General astronomy

the time required for the Earth to complete an exactly 360° orbit around the Sun as measured with respect to the stars = 365.2564 mean solar days (contrast with tropical year).

solar day

Astronomy; General astronomy

time between successive meridian crossings of the Sun. Our clocks are based on this interval of time (on Earth, one solar day = 24 hours on average).

solar eclipse

Astronomy; General astronomy

when the shadow of the Moon hits the Earth at exactly new phase. The Moon covers up part or all of the Sun.

solar luminosity

Astronomy; General astronomy

unit of power relative to the Sun. One solar luminosity is about 4 x 1026 watts.

solar mass

Astronomy; General astronomy

unit of mass relative to the Sun. One solar mass is about 2 x 1030 kilograms

the number of neutrinos observed to be coming from the Sun's core is significantly less than what was predicted by the original solar interior models. Discovery of the oscillation of neutrino types ...