Astro Calendar 1991, Astrological Calendar, Online Astrology All planets Sun Mercury Venus Mars Jupiter Saturn Uranus Neptune Pluto Node Lilith Chiron. Jan 5, 1991, 05:04. Venus enters Aquarius. ( chart ) Jan 14, 1991, 08:02. Mercury enters Capricorn. ( chart ) Jan 20, 1991, 13:48. Sun enters Aquarius.