Thursday December 22nd the planets Mars and Jupiter are aligned in an arrangement known as heliocentric opposition. The two planets are on opposite sides of the Sun and are approximately 180o apart in heliocentric longitude as measured around the celestial equator. Mars has a heliocentric longitude of approximately 10o, while Jupiter is at 190o. However the two planets are not necessarily at the same level (above or below) relative to the ecliptic. Both planets are south of the celestial equator with Mars at 12o South Declination in Aquarius the Water Bearer, and Jupiter, at 6o South Declination, is in the constellation of Virgo the Harvest Maiden.