• Alison L. Mead

Halo

The halo over the sun this past weekend was meteorological, more associated with our atmosphere than astronomical. The halo was caused by high altitude ice crystals which reside from three to six miles in the air. When there is an over abundance of ice crystals in the atmosphere, a halo forms over the sun.

These ice crystals can also create a sun dog, an event very similar to a halo.

Extreme Tides

Tides this weekend are both extremely high and low. Tides are running high at close to noon and at close to midnight. Tides are running low around sunrise and sunset. Tides are created by the gravitational pull of the sun and moon, which will be higher than usual this weekend.

The moon is both full this weekend and particularly close. Full moon is Saturday. The moon is in perigee on Sunday, closer to the Earth than at any other time in its 28 day elliptical orbit around the earth. The moon is slightly more than 222,000 miles away; about 30,000 miles closer to us than when it is farthest from the Earth, in apogee.

The sun’s gravitational pull on the other side of the sky is also greater at the moment as the moon and sun are opposite in our sky.

This astronomical event happens about three or four times a year. The wrack line on all beaches will rise higher than usual. Sand bars that are usually underwater will be revealed.

Sunrise and Sunset
Day Sunrise Sunset
Fri., May 24 5:14 8:02
Sat., May 25 5:13 8:03
Sun., May 26 5:13 8:04
Mon., May 27 5:12 8:05
Tues., May 28 5:11 8:06
Wed., May 29 5:11 8:06
Thurs., May 30 5:10 8:07
Fri., May 31 5:10 8:08
Temperatures and Precipitations
Day Max (Fº) Min (Fº) Inches
May 17 73 52 0.00
May 18 65 42 0.00
May 19 69 46 0.00
May 20 69 55 0.19
May 21 74 56 0.01
May 22 71 53 T
May 23 71 58 T

Water temperature in Edgartown harbor: 63º F.

 

Comments

Comment policy »

YOU CAN HELP SUPPORT LOCAL NEWS

Subscribe or become a Friend of the Vineyard Gazette and receive our free newsletters and free and discounted tickets to Gazette events along with our award-winning news and photography.