Pick up the incorrect statement from the following: A. Apparent solar time is measured from the lower transit of the true sun B. Mean solar time is measured from the lower transit of the mean sun C. Sidereal time is measured from the lower transit of the first point of Aries D. Sidereal time is measured from the upper transit of the first point of Aries

The correct answer is D. Sidereal time is measured from the lower transit of the

first point of Aries.

Apparent solar time is

measured from the lower transit of the true sun. The true sun is the actual position of the sun in the sky. The mean sun is a hypothetical sun that moves across the sky at a constant rate. Mean solar time is measured from the lower transit of the mean sun. The first point of Aries is the point in the sky where the ecliptic, the apparent path of the sun across the sky, intersects the celestial equator. Sidereal time is measured from the lower transit of the first point of Aries.

The reason why D is the incorrect statement is because sidereal time is measured from the lower transit of the first point of Aries, not the upper transit. The lower transit of a celestial object is when it crosses the celestial equator from south to north. The upper transit is when it crosses the celestial equator from north to south.