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In astronomy, the rotation period or spin period [1] of a celestial object (e.g., star, planet, moon, asteroid) has two definitions. The first one corresponds to the sidereal rotation period (or sidereal day), i.e., the time that the object takes to complete a full rotation around its axis relative to the background stars (inertial space).
Orbit eccentricity causes the planet/Sun distance to change during the year: The higher is the eccentricity, the higher is the change; Sun rays intensity in various moments of the year changes as the planet/Sun distance changes. Earth eccentricity is very low (0.0167 in a scale from 0 to 1.0000), hence it does not affect so much temperature ...
One galactic year is approximately 225 million Earth years. [2] The Solar System is traveling at an average speed of 230 km/s (828,000 km/h) or 143 mi/s (514,000 mph) within its trajectory around the Galactic Center, [ 3 ] a speed at which an object could circumnavigate the Earth's equator in 2 minutes and 54 seconds; that speed corresponds to ...
Three systems are used as frames of reference for tracking planetary rotation, particularly when graphing the motion of atmospheric features. System I applies to latitudes from 7° N to 7° S; its period is the planet's shortest, at 9h 50 m 30.0s. System II applies at latitudes north and south of these; its period is 9h 55 m 40.6s. [136]
The sidereal year differs from the solar year, "the period of time required for the ecliptic longitude of the Sun to increase 360 degrees", [2] due to the precession of the equinoxes. The sidereal year is 20 min 24.5 s longer than the mean tropical year at J2000.0 (365.242 190 402 ephemeris days). [1]
June features the shortest nights of the year across the Northern Hemisphere, but there will still be plenty to see during the abbreviated periods when the sun is below the horizon -- including a ...
Longest orbital period (Longest year) Gliese 900 b (CW2335+0142) Gliese 900: 1.27 million years [60] [1] [f] COCONUTS-2b previously held this record at 1,100,000 years. [f] Shortest orbital period (Shortest year) SDSS J1730+5545 b: SDSS J1730+5545: 0.5866 h (35 minutes) [61] K2-137b has the shortest orbit around a main-sequence star (an M dwarf ...
Six planets will be in alignment during the planet parade: Mars, Jupiter, Uranus, Neptune, Venus, and Saturn. Uranus and Neptune won't appear as "bright planets," so you'll need a telescope or ...