The constellation is determined by new _ constellation according to the new calendar or lunar calendar.

Are the twelve constellations based on the new date or the original date?

It depends on what genre it is.

Generally, astrology schools in Europe and America advocate starting from a fixed vernal equinox and analogizing the division of 12 constellations, that is, the division of the same date.

However, the Indian astrology school advocates that the beginning of the first house should be adjusted according to the actual position of the vernal equinox, rather than sticking to an inaccurate time point. They think that only in this way can divination be more accurate, so there is a so-called new division.

So it depends on what kind of reasoning you use.

Of course, at present, most people contact European and American schools, that is, the calculation method starting with March 2 1 as the fixed vernal equinox.