May 12, 2021: Thirty minutes after sunset, the razor-thin moon is 1.2° to the left of brilliant Venus. This is the closest grouping of the moon and Venus during this evening appearance of the brilliant planet. Mercury is 9.1° to the upper left of Venus. Mars maintains its eastward march in Gemini. Sirius and Aldebaran are near their heliacal settings, their final appearances in the evening sky for the year.
The first morning appearance of a star before sunrise is known as the heliacal rising of the star. Sirius, the brightest star, makes its first appearance each year during mid-August from mid-northern latitudes.
May 7, 2021: The planets and moon parade across the sky today. Jupiter and Saturn are visible before sunrise in the southeast. The moon can be seen closer to sunrise. After sunset Venus, Mercury, and Mars are in the west-northwest.
May 6, 2021: During a 24-hour period, the five bright planets and the moon are visible. Before sunrise this morning, Saturn, Jupiter, and the crescent moon are lined up in the southeast. After sunset, brilliant Evening Star Venus is visible after sunset. As the sky darkens Mercury, then Mars, appears in the western sky.
During May 2021, Mars marches across the starfields of Gemini. The planet is visible in the western sky after sunset. Early in the month, Mars is near the feet of Castor. Mars moves through the constellation diagonally from lower right to upper left. It ends the month passing Pollux.
Mercury’s best evening appearance of 2021 occurs during May. The planet is visible in the west-northwest above Venus after sundown. The appearance begins during late April. On May 28, the apparition ends with a close Venus – Mercury conjunction, the closest easily visible until 2033. About 30 Venus – Mercury conjunctions occur during the interval, but some close groupings are lost in the sun’s glare.
After superior conjunction (March 26, 2021), Venus slowly emerges into the western evening sky during bright twilight. The closest Venus – moon grouping occurs on May 12. Venus is moving eastward in Taurus.
2021: Venus is the evening star that is visible in the west for the rest of the year beginning in late April. The crescent moon appears with Venus each month. Venus conjunctions occur with Mercury, Mars and bright stars.
May 12, 2021: Before sunrise bright Jupiter, in front of Aquarius, is in the southeast before sunrise. Saturn is to the upper right of Jupiter, in Capricornus. In a few mornings, Saturn begins to retrograde.
May 11, 2021: The planet parade continues today. Five planets are on display. Bright Jupiter and Saturn are in the southeastern sky before sunrise. After sundown, brilliant Venus, Mercury, and Mars are in the western sky. The moon is at its New phase and at apogee today.
May 10, 2021: Five planets are on display. Jupiter and Saturn are visible in the southeastern sky before sunrise. Brilliant Venus, Mercury, and Mars shine from the western sky after sunset. Only the sun disrupts a continuous view of the five worlds.
May 8, 2021: Five planets are visible during morning and evening appearances. Jupiter and Saturn are visible before sunrise. Daylight interrupts the viewing until evening, when Venus, Mercury, and Mars are visible in the west after sundown.