A sidereal day is shorter than a solar day. This difference is due to（）.
A: irregularities in the daily rotational rate of the Sun
B: the space motion of the solar system
C: the precession of the equinoxes
D: the use of different reference point
A: irregularities in the daily rotational rate of the Sun
B: the space motion of the solar system
C: the precession of the equinoxes
D: the use of different reference point
举一反三
- Corresponding to the sun in the solar system is the nucleus of the atom.
- During the first half of the year, minor solar terms are around 8th day of a solar month and major solar terms around 23rd.
- The Lantern Festival falls on the 15th day of the 1st solar month.
- .A solar day is the length of time------ the Earth to revolve once around the Sun.
- According to Newton's principle ______. A: the force of gravity keeps planets orbiting around the sun rather than flying off B: the sun is the most massive object, making up 99.8 percent of the mass of the solar system C: the amount of mass determine how fast the objects travel as they orbit each other D: Pluto receives the least force of gravity from the sun of all the planets in the solar system