The motion of the sun relative to the local static standard
The sun movement refers to the movement of the sun relative to the local static standard, also known as the sun's intrinsic motion.1783, F.W. Herschel analysisSiriusBeihe IIBeihe III、Nanhe III、Xuanyuan XIV、arcturusandHegu IIOf the seven starsvoluntarilyIt is believed that their movement trend is a reflection of the movement of the sun in space, and it is pointed out that the sun moves towards Hercules.In 1837, Agrandel confirmed that FW. Herschel's conclusion.
According to the observation, the sun's speed of motion to nearby stars is 19.7 kilometers per second, toward a point in the constellation Hercules, whose celestial coordinates in the 1950.0 epoch are the right ascensionα=184 ± 7, declinationδ=+30°±1°。The corresponding silver coordinates areLPull down=56 °,bPull down=23 °.This point is called the sun facing point, which is called the sun facing point for short.The opposite point on the celestial sphere is called the solar dorsal point, or simply the dorsal point.The star near the heading point approaches the sun, and the radial velocity reaches the maximum at the heading point.The stars near the back point gradually leave the sun, and the apparent velocity reaches a maximum at the back point.
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Sun relative toLocal static standardThe motion of the sun is also called the sun's prime motion.The local static standard can be determined from two aspects.They are all reference frames with the sun as the instantaneous center.One aspect is the dynamic static standard, which is defined as the sun circlingSilver coreMove in a circular orbit.Therefore, all stars near the sun with the same revolution are relatively stationary in this reference frame.The other aspect is the kinematic local static standard, which makes the space velocity of all stars near the sun equal to zero. In fact, it is the frame of the average motion of local stars centered on the silver center.
