Celestial Highlights for March 2015
Posted: Tuesday, March 3rd, 2015
by Robert Victor with twilight sky maps by Robert D. Miller
Links to evening and morning twilight sky maps for use in southern California in March 2015 appear below. Links to related activities on the changing visibility of stars and planets, a selection of sky maps for northern California (exact for lat. 40° N), and a preview of Comet Halley’s next appearance in 2061, are now available at www.abramsplanetarium.org/msta/
March 2015 at dusk. At dusk in early March 2015, the four brightest “stars”, in order of brilliance, are: Venus in west; Jupiter, in eastern sky; Sirius, the “Dog Star”, 40 degrees up in south as seen from the Coachella Valley, and Canopus, less than 4 degrees up when it passes due south about 21 minutes before Sirius does. Sounds of nature enrich the stargazing experience. In Palm Springs, we’ve been hearing frogs in nearby Tahquitz Creek on warmer nights since December.
Canopus passes directly overhead for observers near latitude 53° south, within 14° N of the Antarctic Circle, so you’d have to go all the way to southern Argentina or Chile to stand on terra firma directly beneath the star. From the Coachella Valley, you must choose your site carefully, or mountains might block your view. From my abode in Palm Springs, I see Canopus blink off when it goes behind a mountainside several minutes before it reaches its high point.
From Palm Springs and Desert Hot Springs, Canopus passes due south only 4° up in a dark sky at 7:32 p.m. PST on March 1, and then four minutes earlier each day, to 7:08 p.m. on March 7, and suddenly to 8:04 p.m. PDT on Sunday, March 8, an hour later than you might expect, until you recall that you’ve just reset your clock to daylight saving time. (Your friends elsewhere in southern California should add 4 minutes to these times for every degree their longitude is west of 116.5°, or subtract if east.) By March 11 or 12 the star reaches its high point only about an hour after sunset. Within a few days more, as the star’s “transit time” backs closer to the time of sunset, the sky will become too bright to catch Canopus at its high point.
Other features of the early evening: A telescope reveals Venus now in gibbous phase, and up to four of Jupiter’s moons discovered by Galileo in 1610. Venus and Jupiter, closing from 123° apart on March 1, to 85° apart on the 31st, will have a spectacular pairing on June 30. Mars, now on the far side of its orbit, doesn’t reveal much telescopically, but it’s visible to naked eye and binoculars, sinking lower in twilight 4° to 17° below Venus.
Orion’s 3-star belt (not bright enough to be shown on our twilight chart) lies midway between red Betelgeuse and blue Rigel. The belt points the way leftward toward Sirius, and the opposite way toward Aldebaran, eye of Taurus, the Bull, and beyond to the Pleiades or “Seven Sisters” star cluster (also not plotted, but beautiful in binoculars). The huge “Winter Hexagon”, in counterclockwise order Sirius-Rigel-Aldebaran-Capella-Pollux-(Castor, not shown)-Procyon and back to Sirius, with Betelgeuse inside, contains 7 of the 21 stellar objects of first magnitude or brighter (16 stars and 5 planets) ever visible from southern California. Their constellations include a bull backing away from a charging hunter and his two canine followers, a pair of twins, and a chariot driver with mother goat and three kids on his shoulder.
Following this menagerie is bright Jupiter, itself followed by Leo, the Lion, with the star Regulus marking his heart. Perhaps the Lion is chasing his dinner across the sky? Quite a menu!
By March’s end, Arcturus, the “Bear Guardian” star, pops up above the ENE horizon before mid-twilight. Use this memory aid: “Follow the arc (curve of the bear’s tail or handle of the Big Dipper) to Arcturus.”
March Moon Madness
The Moon can be easily spotted daily at evening mid-twilight (about 40 minutes after sunset) March 1-5 and March 21-April 4.
At dusk on Monday, March 2, the fat gibbous Moon is well up in the eastern sky, 5°-6° north (upper left) of Jupiter. Now through July, the Moon will pass Jupiter in the evening sky every 27 or 28 days. The interval is shorter than the Moon’s cycle of phases, 29.5 days, so each time it overtakes Jupiter, the Moon will appear progressively less full.
On March 4, the nearly Full Moon will rise 35-40 minutes before sunset, and on March 5, the Moon, just past Full, rises shortly after sunset. In the following days, moonrise occurs nearly an hour later each night, making it more convenient to switch your moon-watching time to predawn.
The brightest objects in morning twilight, in order of brilliance, are: Arcturus high in WSW to W; Vega high in NE; early in month, Mercury low in ESE, closely matches or slightly outshines Arcturus, but it sinks into bright twilight after midmonth as it approaches the far side of the Sun. Saturn, steady in S to SW, is next in brightness in the morning sky.
Look earlier than map time, at least an hour before sunrise, and you’ll find the Big Dipper in NW. Follow its curved handle to Arcturus, and then to Spica. Tip: “Follow the arc to Arcturus and drive a spike to Spica.”
Near Vega are Altair to its lower right and Deneb to its lower left, completing the Summer Triangle.
Compare steady Saturn to reddish twinkling reddish Antares, heart of the Scorpion, 8°-9° to the planet’s lower left.
A telescope reveals the rings of Saturn, now tipped more than 24 degrees from edge-on!
As the sky brightens, listen for the sounds of birds. Is the soundscape the same from week to week as spring progresses?
In morning twilight on Thursday, March 5, the Full Moon is low in the west, with Regulus setting 4°-5° to its lower right. On March 8 and 9, the waning gibbous Moon appears in SW near Spica. On Thursday, March 12, Saturn appears within 3° lower right of the Moon in S, while the reddish twinkling star Antares appears 8°-9° to their lower left. On Friday, Mar. 13, the Moon is close to half full and essentially at Last Quarter phase, 90° or one quarter-circle west of the Sun and 14°-16° left (east) of Antares and Saturn. The last easy morning view of the waning Moon will come on Wed. Mar. 18, when it’s very low in E to ESE in morning twilight. [The invisible] New Moon on Fri. Mar. 20 at 2:36 a.m. PDT produces a total solar eclipse in the Arctic.
Moon returns to evening: On Sat. Mar. 21 at dusk, the 1.7-day-old waxing crescent will be very easy to spot. Mars will be 2° to its lower right. For a few more evenings, look for beautiful earthshine, from sunlight reflected by Earth onto the Moon’s dark (non-sunlit) side. Watch the crescent thicken daily as it moves farther from the Sun on each successive evening. It is 4° upper left of Venus on the next evening, Sun. Mar. 22, and passes widely south of the Pleiades star cluster at nightfall on March 23. The Moon appears within the “V” of the Hyades cluster and 3° lower right Aldebaran on the next evening, Tues. Mar. 24.
The Moon appears inside the Winter Hexagon March 25-27, and has nearly reached First Quarter phase, half full and 90° from the Sun, on the middle one of those three evenings, Thurs. Mar. 26. On Sat. Mar. 28, the Moon is outside the Hexagon, just east of the Procyon to Pollux line, and on Sun. Mar. 29 the Moon appears 6° S of Jupiter. On the last two evenings of March, the Moon is not far from Regulus, heart of Leo the Lion.
A special night: On Friday evening, April 3, the nearly Full Moon rises 4°-5° S of due east about 26 minutes before sunset. About 13 minutes before sunset, Sun and Moon can be viewed simultaneously, in opposite directions, each about 2° above unobstructed horizons. About an hour after sunset, look for Spica 13° below the Moon. A total lunar eclipse will happen early Saturday morning, April 4.
At 3:16 a.m. PDT on Saturday April 4, a partial eclipse begins as the Moon enters the umbra, or dark central core of Earth’s shadow. The Moon will then be in the southwest, with Spica 11° to its left. As minutes pass, the dark circular edge of Earth’s shadow will become apparent. The Moon will pass through the northernmost part of Earth’s dark central shadow, resulting in a brief total lunar eclipse lasting only 5 minutes, from 4:58 a.m. until 5:03 a.m. PDT. At deepest eclipse at 5:00 a.m., Palm Springs will see the Moon 18° up in WSW, with Spica 10° to its upper left.
The brightness and color of the Moon during a total eclipse varies widely from one eclipse to another, depending on atmospheric conditions over places on Earth where Sun is rising or setting at time of eclipse. Sunlight must pass through these zones in order to reach Moon during total eclipse, and presence of clouds in lower atmosphere or volcanic aerosols in stratosphere can block much of the sunlight and darken Earth’s shadow. The great volcanic eruptions of 1963, 1982, and 1991 were each followed by exceptionally dark total lunar eclipses. The French astronomer Andre Danjon devised a five-point brightness or luminosity scale to help observers rate darkness and color of a total lunar eclipse. Observe for yourself how the eclipse on morning of April 4 compares to others! Get Danjon’s scale at http://eclipse.gsfc.nasa.gov/OH/Danjon.html and then select the rating from the 5-point L (luminosity) scale best matching the darkness and color of the Moon at beginning, middle, and end of totality.
After 5:03 a.m., the Moon slowly withdraws from the Earth’s umbral shadow, until 6:45 a.m., when the partial phase of the eclipse comes to an end. But from the Coachella Valley, the moon sets before the end of the partial eclipse.
Another total lunar eclipse, the fourth and last in a tetrad of total lunar eclipses at 6-month intervals since April 2014, will be seen at a much more convenient hour for students and the general public, beginning at dusk, Sunday, Sept. 27.
For more information on sky events in 2015, see these articles and activities.
(A selection of twilight sky charts for use during months of the best planet gatherings.)
(Scroll down to “Modeling seasonal visibility of stars and visibility of the planets.” Includes planet orbit charts, a data table for plotting planets, and an activity sheet with 15 questions on visibility of stars and planets in 2015-2016.)
Robert D. Miller, who provided the twilight charts, did graduate work in Planetarium Science and later astronomy and computer science at Michigan State University and remains active in research and public outreach in astronomy.
Posted: Wednesday, October 12th, 2016
by Jessica Sawko
In June 2016 California submitted a waiver application to discontinue using the old CST (based on 1998 standards) and conduct two years of pilot and field tests (in spring 2017 and 2018, respectively) of the new science assessment designed to support our state’s current science standards (California Next Generation Science Standards (CA-NGSS) adopted in 2013). The waiver was requested because no student scores will be provided as a part of the pilot and field tests. The CDE received a response from the U.S. Department of Education (ED) on September 30, 2016, which provides the CDE the opportunity to resubmit a revised waiver request within 60 days. The CDE will be revising the waiver request and resubmitting as ED suggested.
At its October 2016 North/South Assessment meetings CDE confirmed that there will be no administration of the old CST in the spring of 2017. (An archive of the meeting is available at http://www.cde.ca.gov/ta/tg/ai/infomeeting.asp.) Learn More…
Posted: Thursday, September 22nd, 2016
by Carol Peterson
1) To celebrate the 100th anniversary of the National Park Service, Google has put together a collection of virtual tours combining 360-degree video, panoramic photos and expert narration. It’s called “The Hidden Worlds of the National Parks” and is accessible right from the browser. You can choose from one of five different locales, including the Kenai Fjords in Alaska and Bryce Canyon in Utah, and get a guided “tour” from a local park ranger. Each one has a few virtual vistas to explore, with documentary-style voiceovers and extra media hidden behind clickable thumbnails. Ideas are included for use in classrooms. https://www.engadget.com/2016/08/25/google-offers-360-degree-tours-of-us-national-parks/. Learn More…
Posted: Thursday, September 22nd, 2016
CSTA is pleased to announce the winners of the 2016 CSTA Awards for Distinguished Contributions, Margaret Nicholson Distinguished Service Award, 2014 and 2015 PAEMST-Science recipients from California, and the 2016 California PAEMST Finalists. The following individuals and organizations will be honored during the 2016 California Science Education Conference on October 21- 23 in Palm Springs. This year’s group of awardees are truly outstanding. Please join us in congratulating them!
Margaret Nicholson Distinguished Service Award
The Margaret Nicholson Distinguished Service Award honors an individual who has made a significant contribution to science education in the state and who, through years of leadership and service, has truly made a positive impact on the quality of science teaching. This year’s recipient is John Keller, Ph.D. Dr. Keller is Associate Professor, Cal Poly San Luis Obispo and Co-Director, Center for Engineering, Science, and Mathematics Education, Cal Poly San Luis Obispo. In her letter of recommendation, SDSU science education faculty and former CSTA board member Donna Ross wrote: “He brings people together who share the desire to make a difference in the development and implementation of programs for science teaching. Examples of these projects include the Math and Science Teaching Initiative (MSTI), Noyce Scholars Program, Western Regional Noyce Initiative, and the Science Teacher and Researcher (STAR) program.” Through his work, he has had a dramatic impact on science teacher education, both preservice and in-service, in California, the region, and the country. He developed and implemented the STEM Teacher and Researcher Program which aims to produce excellent K-12 STEM teachers by providing aspiring teachers with opportunities to do authentic research while helping them translate their research experience into classroom practice. SFSU faculty member Larry Horvath said it best in his letter:“John Keller exemplifies the best aspects of a scientist, science educator, and mentor. His contributions to science education in the state of California are varied, significant, and I am sure will continue well into the future.” Learn More…
Posted: Tuesday, September 20th, 2016
by Peter A’hearn
NGSS is a big shift. Teachers need to learn new content, figure out how this whole engineering thing relates to science, and develop new unit and lesson plans. How could NGSS possibly make life easier?
The idea that NGSS could make our lives easier came to me during the California State NGSS Rollout #1 Classroom Example lesson on chromatography. I have since done this lesson with high school chemistry students and it made me think back to having my own students do chromatography. I spent lots of time preparing to make sure the experiment went well and achieved the “correct” result. I pre-prepared the solutions and organized and prepped the materials. I re-wrote and re-wrote again the procedure so there was no way a kid could get it wrong. I spent 20 minutes before the lab modeling all of the steps in class, so there was no way to do it wrong. Except that it turns out there were many. Learn More…
Posted: Tuesday, September 20th, 2016
by Robert C. Victor. Twilight sky maps by Robert D. Miller. Graph of evening planet setting times by Dr. Jeffrey L. Hunt
Our evening twilight chart for September, depicting the sky about 40 minutes after sunset from SoCal, shows brilliant Venus remaining low, creeping from W to WSW and gaining a little altitude as the month progresses. Its close encounter within 2.5° N of Spica on Sept. 18 is best seen with binoculars to catch the star low in bright twilight. The brightest stars in the evening sky are golden Arcturus descending in the west, and blue-white Vega passing just north of overhead. Look for Altair and Deneb completing the Summer Triangle with Vega. The triangle of Mars-Saturn-Antares expands as Mars seems to hold nearly stationary in SSW as the month progresses, while Saturn and Antares slink off to the SW. Learn More…