行业协会秘书长待遇:This Week's Sky at a Glance for March 18 – 26

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This Week's Sky at a Glance

Some daily events in the changing sky for March 18 – 26.

by Alan M. MacRobert

Friday, March 18

  • By mid-evening, look far to thelower left of the Moon for Saturn and, below it, twinkly Spica on therise. Far to their left sparkles brighter Arcturus, the "Spring Star."

    The big bright Moon guides the way to Saturn and its springtime surroundings.Sky & Telescope diagramSaturday, March 19

  • Full Moon (exact at 2:10p.m. Eastern Daylight Time). The Moon is in Virgo, along with Saturn andSpica as shown at right. The Moon is at perigee, and this is aslightly closer perigee than usual. So the Moon will appear bigger andbrighter than it has in 19 years — but only by a slight trace!

    Sunday, March 20

  • Spica is near the Moon tonight.
  • The March equinox comes at 7:21 p.m. EDT, marking the start of springin the Northern Hemisphere. This is when the Sun crosses the equatorheading north for the year.

    Monday, March 21

  • Mercury is at its highest in the evening sky from now until Wednesday. Use our article to locate Mercury a half hour after sunset.

    Tuesday, March 22

  • These next two weeks, when there's no moonlight in the sky at the end of twilight, are a fine time to look for the zodiacal light(from mid-northern latitudes) if you have a very clear, unpolluted sky.As the last of twilight is fading away, look for a vague but huge,tall, narrow pyramid of pearly light extending up from the westernhorizon. It slopes to the left, following the ecliptic. What you'reseeing is interplanetary dust near the plane of the solar system, lit bythe Sun.

    Orion, with belt horizontal, was declining in the southwest when S&T's Tony Flanders took this 15-second exposure with a Canon A80 pocket digital camera.S&T: Tony FlandersWednesday, March 23

  • By midevening Orion is tilting into the southwest, with his three-star belt now level — a sign of spring's arrival.

    Thursday, March 24

  • If you've got atelescope, you've probably looked at the Great Orion Nebula many timesthis season. So it's time to branch out before Orion goes away for thespring. Right after dark, hunt out little-known clusters and nebulaespotlighted and charted in Sue French's article "Oddities in NorthernOrion" in the March Sky & Telescope, page 64.
  • Algol, in Perseus in the northwestern sky, is at its minimum brightness(magnitude 3.4 instead of its usual 2.1) for a couple hours centered on8:38 p.m. Pacific Daylight Time.

    Friday, March 25

  • A binocular challenge: Seeit you can hunt out the trio of Messier galaxies under the belly ofLeo: M95, M96, and M105. Use Gary Seronik's "Binocular Highlight"article and chart in the April Sky & Telescope, page 45. You'll need a really dark sky! A telescope shows them much more easily.

    Saturday, March 26

  • Last-quarter Moon (exactat 8:07 a.m. EDT). The half-lit Moon rises in the middle of the nightand is high in the south before sunrise.

    • This Week's Sky at a Glance for March 18 – 26 This Week's Sky at a Glance for March 4 – 12 This Week's Sky at a Glance for March 25 – April 2. This Week's Sky at a Glance for February 18 – 26. This Week's Sky at a Glance February 25 – March 5. This Week's Sky at a Glance for December 31 – January 8 This Week's Sky at a Glance for January 7 – 15. This Week's Sky at a Glance for January 14 – 22 This Week's Sky at a Glance for January 21 – 29 This Week's Sky at a Glance for January 28 – February 5 This Week's Sky at a Glance for February 4 – 12 This Week's Sky at a Glance for April 8 – 16 This Week's Sky at a Glance for April 15 – 23 This Week's Sky at a Glance for April 22 –30 This Week's Sky at a Glance for May 20 – 28 This Week's Sky at a Glance for May 27 – June 4. This Week's Sky at a Glance for June 3 – 6 This Week's Sky at a Glance for June 17 – 25 This Week's Sky at a Glance for July 29 – August 6 This Week's Sky at a Glance for September 8 – 17 This Week's Sky at a Glance for September 16 – 24 This Week's Sky at a Glance for June 24 - July 2 This Week's Sky at a Glance - SkyandTelescope.com This Week's Sky at a Glance April 1 – 9