The purpose of this feature is to give scout leaders, educators and naturalists an idea of some of the natural events coming up each month. We will try to cover a variety of natural events ranging from sky events to calling periods of amphibians, bird and mammal watching tips, prominent wildflowers and anything else that comes to mind. We will also note prominent constellations appearing over the eastern horizon at mid-evening each month for our area for those who would like to learn the constellations. If you have suggestions for other types of natural information you would like to see added to this calendar, let us know! Note: You can click on the hyperlinks to learn more about some of the featured items. To return to the Calendar, hit the "back" button on your browser, NOT the "back" button on the web page. All charts are available in a "printer friendly" mode, with black stars on a white background. Left clicking on each chart will take you to a printable black and white image. Please note that images on these pages are meant to be displayed at 100%. If your browser zooms into a higher magnification than that, the images may lose quality. Though we link book references to nationwide sources, we encourage you to support your local book store whenever possible.
Notes and Images From October 2018 Fall brings sparkling clear nights and starscapes that keep you from noticing the chilly temperatures. October 4th was such a night. Looking south from my driveway, the Milky Way stretched from Sagittarius, on the southwest horizon, up over my head and down into Cassiopeia and Perseus. Cygnus the Swan was overhead, its long neck stretched out westward along the Milky Way. How many flocks of warblers and other songbirds were migrating south in the darkness overhead? High in the eastern sky, Pegasus the flying horse is inverted, as if caught in the middle of a barrel roll. I went back inside and got my camera, set it on a tripod, and made the image below. The reddish star Enif, marking the nose of Pegasus, is at upper left. To its right and in the middle of the Milky Way is the bright bluish star Deneb, marking the tail of Cygnus. Just above it you can see the magenta color of the North American Nebula. Finally, just above the Milky Way in the center of the image, is Altair, in Aquila the Eagle. Lots of night flyers overhead!
Looking towards the Milky Way in Sagittarius, one looks towards the core of our galaxy. But overhead, and into the northeastern sky, the Milky Way traces out our galaxy's spiral arms. The center of our galaxy is dominated by older golden stars. Young bluish stars are more prevalent in the spiral arms, and you can see this color shift in the image. You may want to compare the colors, and the great dust clouds, with an image of NGC 4565, an edge-on galaxy in Coma Berenices. The brightest part of the Milky Way in the image above is the great Scutum star cloud. The image shows stars and dust clouds much too faint to be seen with the naked eye, though the eye can make out some of the dark dust lanes. The image was a single 30-second exposure with a Nikon D750 camera and a Rokinon 14mm lens. - Sky Events for November 2018: The Leonid Meteor Shower peaks in the morning hours of November 17th. Evening Sky: Jupiter quickly disappears into the evening twilight glow this month.
Venus will appear in the eastern sky before sunrise this month, and if you catch it early in the month you should be able to see the tiny waxing crescent. You can see the crescent in 7x30 binoculars if they are of good quality. The crescent will wax fuller throughout the month. Saturn is in Sagittarius this month. Look for it about 24 degrees above the Southern horizon at dusk. The tilt of the rings has now opened to 26 degrees, and the view is spectacular in any size telescope. The globe of Saturn is now 15.7 seconds of an arc in apparent diameter. Times given are in EDT for Chattanooga. Those in other time zones will need to adjust the given times accordingly.
Constellations: The views below show the sky looking east at 11:00pm EST on November 15th. The first view shows the sky with the constellations outlined and names depicted. Star and planet names are in green. Constellation names are in blue. The second view shows the same scene without labels. Auriga , the Charioteer, with its bright star Capella, is prominent in the northeast. Look for the bright stars Castor and Pollux as the constellation Gemini, The Twins, clears the horizon. In the southeast, mighty Orion clears the horizon with its bright stars Betelgeuse and Rigel. Note the difference in color between the two stars. Betelgeuse is a red giant and looks orange. Rigel is a very hot supergiant and looks bluish. Looking at the center of the three "sword" stars with binoculars, you can see M42, the Orion Nebula. Just poking its head above the horizon is Lepus, The Hare.On Learning the Constellations: We advise learning a few constellations each month, and then following them through the seasons. Once you associate a particular constellation coming over the eastern horizon at a certain time of year, you may start thinking about it like an old friend, looking forward to its arrival each season. The stars in the evening scene above, for instance, will always be in the same place relative to the horizon at the same time and date each November. Of course, the planets do move slowly through the constellations, but with practice you will learn to identify them from their appearance. In particular, learn the brightest stars for they will guide you to the fainter stars. Once you can locate the more prominent constellations, you can "branch out" to other constellations around them. It may take you a little while to get a sense of scale, to translate what you see on the computer screen or what you see on the page of a book to what you see in the sky. Look for patterns, like the stars that make up Orion. The Earth's rotation causes the constellations to appear to move across the sky just as the Sun and the Moon appear to do. If you go outside earlier than the time shown on the charts, the constellations will be closer to the eastern horizon. If you observe later, they will have climbed higher. As each season progresses, the Earth's motion around the Sun causes the constellations to appear a little farther towards the west each night for any given time of night. If you want to see where the constellations in the above figures will be on December 15th at 11:00pm EST, you can stay up till 1:00am on November 16th and get a preview. The westward motion of the constellations is equivalent to two hours per month. Recommended: Sky & Telescope's Pocket Star Atlas is beautiful, compact star atlas. A good book to learn the constellations is Patterns in the Sky, by Hewitt-White. You may also want to check out at H. A. Rey's classic, The Stars, A New Way to See Them. For sky watching tips, an inexpensive good guide is Secrets of Stargazing, by Becky Ramotowski.
A good general reference book on astronomy is the Peterson
Field Guide,
A Field Guide to the Stars and Planets, by Pasachoff. The book retails for around $14.00.
The Virtual Moon Atlas is a terrific way to learn the surface features of the Moon. And it's free software. You can download the Virtual Moon Atlas here. Apps: We really love the Sky Safari 6 Pro. It is available for both iOS and Android operating systems. There are three versions. The Pro is simply the best astronomy app we've ever seen. The description of the Pro version reads, "includes over 100 million stars, 3 million galaxies down to 18th magnitude, and 750,000 solar system objects; including every comet and asteroid ever discovered." A nother great app is the Photographer's Ephemeris. Great for finding sunrise, moonrise, sunset and moonset times and the precise place on the horizon that the event will occur. Invaluable not only for planning photographs, but also nice to plan an outing to watch the full moon rise. Available for both androids and iOS.
Amphibians:
Recommended: The Frogs and Toads of North America, Lang Elliott, Houghton Mifflin Co.
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