Star calendar May 2017

Star calendar May 2017

1 May     High in the west at dusk, Procyon is 1 fist-width to the waxing crescent moon’s lower left. Pollux is 1 fist-width to the upper right. Dimmer magnitude 1.93 Castor is 2 finger-widths to the right of Pollux.

3 May     Magnitude 1.4 Regulus is only 2 finger-widths to the left of the first-quarter moon at dusk.

7 May     The waxing gibbous moon is 1 finger-width to the lower left of magnitude -1.4 Jupiter. Magnitude 0.98 Spica is 4 finger-widths below the moon.

8 May     Spica is 3 finger-widths to the moon’s upper right tonight. The bright star 3 fist-widths to the moon’s upper left is magnitude 1.6 Arcturus.

12 May    At midnight, Antares, the heart of the Scorpion, is 1 fist-width to the moon’s right, and magnitude 0.2 Saturn is 4 finger-widths to the lower left, just above the horizon. The moon is at apogee, 63.69 Earth-radii (406,000 kilometers) away.

13 May    Saturn is 3 finger-widths to the moon’s lower left before first light. The equation of time reaches a maximum of 3.65 minutes.

17 May    Rising an hour before the sun, Mercury reaches its greatest western elongation, 25.8 degrees from the sun.

19 May    The last-quarter moon is low in the south before first light.

22 May    Look low in the east before dawn to see Venus, 1½ finger-widths to the moon’s upper left.

23 May    The moon lies between Venus, a little more than 1 fist-width to the upper right, and Mercury, less than 4 finger-widths to the lower left, near the eastern horizon before dawn.

26 May    The moon is at perigee, 56.01 Earth-radii (357,000 kilometers) away. Perigee occurs only 5.6 hours after the new moon, so check your tide tables for higher than normal tides.

28 May    Low in the west at dusk, the thin waxing crescent moon is midway between Procyon to the lower left and Pollux to the upper right.

30 May    Regulus is less than 4 finger-widths to the moon’s upper left this evening.

31 May    The moon passes to Regulus’ upper right tonight.

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