The day falls at the midpoint between the old Julian equinox and solstice dates. This is about halfway between the autumn equinox and the winter solstice. Other lines are interpreted as the solstice and equinox curves. The Sun lies in the direction of the vernal equinox around 21 March. Farvardin is the day whose midnight start is nearest to the instant of vernal equinox. This sacrifice takes place about the time of the vernal equinox. It is customary to specify positions of celestial bodies with respect to the vernal equinox. There are also secular holidays such as Kha b-Nisan (vernal equinox). The crossing from north to south is the autumnal equinox or descending node. There is a special meaning of the expression "equinox (and ecliptic/equator) of date". The Angkor Wat temple's main tower aligns to the morning sun of the Spring Equinox. The Qingming Festival is celebrated on the fifteenth day after the Spring Equinox. It begins on the northern Spring equinox. The calendar is therefore framed to prevent the astronomical equinox wandering onto 22 March. Uranus reached its most recent equinox on 7 December 2007.