sidereal

Let us put aside for a moment planetary and sidereal visions, which appear more subjective than objective.

The planetary and sidereal systems which constitute the universe are at different degrees of organization and advancement.

Antares is much further down in the sky, in relation to the arbitrary sidereal axis, and it's a deeper red.

If the clock gains or loses with respect to sidereal time, take this into account in the value of U.

When the hour circle passing through Sirius coincides with the meridian, the sidereal time is 6h.