Cumberland Times-News

Columns

March 16, 2013

It’s easy to explore the moon with binoculars

Last week, the slender crescent moon and a modest comet (PAN STAARS) appeared in the western dusk sky.

With the evening moon becoming much brighter this week, it will be harder to see the comet through the moonlight. Binoculars are recommended.

The comet tonight is the star group Pisces, seen low in the western dusk and only about 18 degrees from the sun. PAN STARRS is moving nearly northward.

On the evening of March 21, the comet will move into the star group Andromeda, being at an angle of 22 degrees from the sun. As March ends, PAN STARRS will be near Andromeda’s shoulders and about 30 degrees from the sun.

While the larger angle to the sun will make it easier to spot, the comet will also be even fainter as it moves away from the sun.

Today, the length of daylight and night are equal. It is widely believed that this condition occurs at the equinoxes, the start of spring and fall.

But on these dates, daylight is about 8 to 10 minutes longer than night. This is due to the sun’s image being lifted about one-half of a degree when it is rising or setting. This bending is caused by the refraction or bending of light when the sun’s light enters the atmosphere at a large angle to the vertical.

So we see the sun rising about four minutes before it actually breaks above the horizon. When the sun appears to set, we see the top of the raised image of the sun four minutes after the sun has dropped below the horizon.

This raising effect is a minimum at the equator where the sun rises and sets vertically, not at a slant as in our area. (Of course, the sun neither rises or sets; it’s the rotating Earth that makes the sun seem to be moving.)

This evening the nearly half-full moon appears near the bright planet Jupiter. The two objects will be only three moon widths apart (1.5 degrees) at 9 p.m. when the sky is quite dark.

Tonight is Lunar Day 6, six days after the moon swung past the sun (New Moon) in going from the morning to the evening side of the sun.

Even without optical equipment, the dark grey plains on the upper half of the moon’s lighted bowl are easy to spot. The detached grey spot is Mare Crisium, a cooled lava basin over 300 miles across.

Three of the other grey plains are clumped together. Nearest is the larger Mare Tranquillitatis, where Apollo 11 (our first manned lunar landing ) set down.

Below Tranquillitatis is the Mare Fecunditatis lava basin, comparable in area to Mare Crisium. Mare Serenitatis is above Tranquillitatis and comparable in size.

With binoculars held steadily this evening, some of the larger craters are in view.

About halfway along the left edge of the moon is the crater Ptolemaeus, named for Astronomer Ptolemy that is nearly 100 miles across. Below and farther to the right (west) is the crater Maurolycus about 75 miles wide.

On Lunar Day 9 (March 20), more large grey plains have rolled into the sunlight. On top is Mare Imbrium. Below Imbrium are three overlapping lava fields.

Binocular viewers will see a very prominent crater in the midst of these lava fields. This is Copernicus, 56 miles across with walls that rise 12,000 feet above its surroundings.

By this Saturday night (Lunar day 11), there is a prominent crater whose bright rays splash across the grey plains as well as the lighter plains (called the Lunar Highlands). This ray system is visible to the eye but the crater requires binoculars.

The crater is Tycho, named for the best observer of stars and planets before telescopes. Near the bottom of the moon is the dark crater Plato (for the famous philosopher).

SKY SIGHTS AHEAD: Orion is now in the southwest evening sky, following Taurus and Jupiter. Orion’s belt points left to Sirius, the night’s brightest star.

Sirius is also the closest star we can see in the night sky, at a distance of nearly nine light years. Lower in the west is the Seven Sisters or Pleiades star cluster, a beautiful sight through binoculars.

The Big Dipper is high in the north and upside down. The leftmost stars of the bowl point down to the North Star, a modest star about which the heavens seem to circle. (The Earth’s North Pole nearly points to the North Star (also known as Polaris).)

Bob Doyle invites any readers comments and questions. E-mail him at rdoyle@frostburg.edu . He is available as a speaker on his column topics.

1
Text Only
Columns
  • Restore them Restore them

    There are an estimated 47,000 deceased veterans whose remains are unidentified and unclaimed throughout the U.S. A group of senators and congressmen hope to do something to
    bring these men and women some dignity after death.

    April 20, 2014 1 Photo

  • Happy Easter

    For the world’s more than 2 billion Christians, Easter is the day that defines their faith.
    The exact date of Christ’s resurrection is unknown, and even the precise locations of his crucifixion and burial are uncertain. This hasn’t stopped some people from saying they know the answer to these questions and others from trying to find out for themselves, or simply arguing about it.
     

    April 20, 2014

  • Odds are good that you didn’t know this

    Odds or Probabilities fascinate many people. There is a special website called www.BookOfOdds.com and an accompanying location on Facebook at /BookofOdds .This website lists 400,000 odds. Three of the people who are involved in this media display have coauthored a book, “The Book of Odds” that presents some of key odds, drawing from polls and statistics published in journals. The authors are A. Shapiro, L.F. Campbell and R. Wright. This paperback was published this year by Harper Collins with ISBN 978-0-06-206085-3.

    April 20, 2014

  • Trivial questions you don’t have to answer

    Every so often in this life, my mind, all on its own, generates questions that have no real answers. So I have decided to pass them on to you. I’m tired of them. If you come up with any answers, let me know. Remember when TV jealously guarded the time zone before 9 p.m. for wholesome shows that children could watch. My gosh, how many years ago was that? It seems like another world nowadays, when you can see murders, torture and rape, or those implied, every hour on the hour, somewhere on your public screen. It might be comforting then, to remember that most children nowadays are glued to their little machines with whole different worlds on them, that they can access all day long. Except that in these different worlds they also can view murders, torture and rape on demand.

    April 20, 2014

  • Think it’s not a small world? You’re wrong

    Yes, you read that right in the paper a couple of weeks ago. I covered a wedding as a newspaper reporter. I’ve retired from doing regular stories because my primary duties lie elsewhere, and I don’t have the time or mental energy for it. But I agreed to do it for a couple of reasons, one of which goes back more than 40 years. The former proprietor of The Famous North End Tavern told me about a wedding that was to take place at the Lions Center for Rehabilitation and Extended Care, where his wife works.

    April 20, 2014

  • No Bambi for you, Mrs. Doe

    Some people want so badly for deer birth control to work that they actually think it will, even on wild populations.
    I wish I had a couple bridges to sell.
    A week ago on the Outdoors page we ran the deer there do what deer  everywhere do. They eat the easiest food available such as gardens and ornamental plantings. They walk in front of moving cars. They give ticks and  parasites a place to live.

    April 19, 2014

  • We concur We concur

    We’re certain that Donald Rumsfeld, who served as Secretary of Defense under Presidents Gerald Ford and George W. Bush, echoes what many Americans feel about the complexity of filing income tax returns.
    When he filed his return, Rumsfeld sent the following letter to the Internal Revenue Service:

    April 16, 2014 1 Photo

  • Library week

    Public libraries remain one of the best uses of taxpayer dollars. They are open to all. Young or old, poor or wealthy, residents can use computers and read current magazines and newspapers. Compact discs featuring a wide variety of music and
    movies on DVD may be checked out in addition to novels and other books.

    April 13, 2014

  • Terps need to move and move quickly

    The good news is Maryland will never have to play another basketball game in the Atlantic Coast Conference. Goodbye, good riddance, sayonara, smell ya, no more of you, stay classy, we won’t let the door hit us on the way out.
    Until we see you in court.

    April 13, 2014

  • Sunday hunting Sunday hunting

    Legislation that increases hunting oppportunities on Sundays in Garrett, Allegany and Washington counties has passed the Maryland General Assembly and reached the governor’s desk.

    April 13, 2014 1 Photo