Fourteen Weeks in Descriptive Astronomy |
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Page 289
... sidereal day is divided into twenty - four equal portions , which are called sidereal hours , and each of these into sixty portions , termed sidereal min- utes , etc. Astronomical clocks are regulated to keep sidereal time . The day ...
... sidereal day is divided into twenty - four equal portions , which are called sidereal hours , and each of these into sixty portions , termed sidereal min- utes , etc. Astronomical clocks are regulated to keep sidereal time . The day ...
Page 290
Joel Dorman Steele. Hence the solar day is about four minutes longer than the sidereal day . For the convenience of so- ciety , it is customary to call the solar day 24 hours long , and make the sidereal day only 23 hr . 56 min . 4 sec ...
Joel Dorman Steele. Hence the solar day is about four minutes longer than the sidereal day . For the convenience of so- ciety , it is customary to call the solar day 24 hours long , and make the sidereal day only 23 hr . 56 min . 4 sec ...
Page 329
... sidereal day ? 289. What are astronomical clocks ? Tell how they are used . Why do astronomers use sidereal time ? What is a solar day ? What causes the difference between a sidereal and a solar day ? To how much time is a degree of ...
... sidereal day ? 289. What are astronomical clocks ? Tell how they are used . Why do astronomers use sidereal time ? What is a solar day ? What causes the difference between a sidereal and a solar day ? To how much time is a degree of ...
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ancients angle aphelion appear astronomers atmosphere axis bright brilliant called Capricornus Cassiopeia Celestial Sphere centre circle color comet conjunction constellation Cor Caroli dark density diameter disk earth east ecliptic equal equator equinoctial figure fixed stars full moon globe heat heavenly bodies heavens Hercules Herschel horizon inclined inferior inferior conjunction inferior planet Jupiter latitude length light longitude luminous lunar magnitude Mars mean distance measured Mercury meridian meteors miles moon moon's motion move naked eye nearly nebula Neptune night node north pole obliquity observer orbit parallax pass path penumbra perihelion Perseus planet polar position rays revolve Right Ascension ring rotation satellites Saturn seasons seen shadow shine side sidereal sidereal day solar system space spots summer sun's superior planet supposed surface synodic revolution tance Taurus telescope theory tion Uranus Ursa Major varies velocity Venus vernal equinox visible zenith zodiac