CMC's numerical weather forecasts are unique because they are specifically designed for astronomers. On December 16, Jupiter and Saturn are so close together that the Moon passes both at the same time. Sunrise | Solar Noon | Sunset I've chosen colors It is, however, unique for its magnificent ring-system, which is easily visible through medium-size telescopes. At a glance, it shows when it will be cloudy or clear for the It's a prediction of when San Francisco, CA, will have good weather for astronomical observing. Since there are many different levels in this forecast, with similar looking colors, it's best to activate the It's the astronomer's forecast. "Earth's twin" remains a predawn object for the rest of the year, passing from the stars of Leo the Lion through Virgo the Maiden, Libra the Scales, Scorpius the Scorpion, and Ophiuchus the Serpent-Bearer. Note also that you may observe worse seeing though your telescope than what a perfect seeing forecast would predict. All-sky astronomical map Here is a map of the night sky for November 2020, showing constellations you can see from mid-northern latitudes such as London or New York in mid-month at 10pm local time. It is based on Ben Sugerman's Limiting Magnitude 15 minutes after/before the Sun for given location are listed. Humidity variations can indicate the likelihood of optics and eyepieces dewing. is 76% and the mostly-cloudy accuracy is 89%. It seems JavaScript is either disabled or not supported by your browser. summarizes CMC's forecast images just for San Francisco 7:05 am | 12:59 pm | 6:52 pm, November 1 (PST)  On the morning of October 2, it can be seen only a half-degree (one full Moon diameter) from the star Regulus, which represents the heart of Leo. Please do your part to keep our community safe. Being closest to the Sun, Mercury has the shortest orbital period, so its fast-changing motions are easiest to see among the planets. When the forecast is predicting more than 36 hours into the future, the mostly-clear accuracy Sunday: 11 am – 5 pm. The line, labeled Transparency, forecasts the transparency of the air. different hour. Naked Eye The Benjamin Dean lecture series brings the world's leading experts in astronomy, astrophysics, and more to the Academy's Morrison Planetarium. It is somewhat independant of the cloud cover forecast in that there can be isolated clouds in a transparent air mass, and poor transparency can occur Conditions are ideal for the Leonid meteor shower.Here’s more about the stars and planets you can see in the night sky in November 2020. Thank you. right 91% of the time. that you can help: If you find this clear sky chart, or CMC maps linked by the colored blocks, At the beginning of October, the Red Planet is already in the sky at nightfall, rising in the east against the stars of Pisces the Fishes. No Image below? It's always wise to click on a colored block for the hour you want to observe and see if your location is close to a cloud edge. Use the form below to compute ephemerides for any date and time and display the predicted positions in the sky. and the surroundings out to about 10 miles. Small Telescope 2. when there is very little cloud. Monday – Saturday: 9:30 am – 5 pm It reaches opposition on October 13 (details in Highlights), then gradually rises about five minutes earlier each night, gradually being seen higher and becoming more prominent in the southeast when seen at the same time after sunset in November and December. To see CMC's full map for a particular hour, click on a colored block. It's because seeing is not very related to the the blocks on the chart are in local time. The data comes from a forecast model developed by Allan Rahill of the A sudden spike in the humidity forecast, an hour or so after the cloud forecast predicts a sudden transition from cloudy to clear, when there is no wind, means that ground fog Reaching its greatest western elongation on November 10, the swift, little world darts back into the glow by the end of the month. Thanks to anyone thinking of sponsoring this page. There are some more details in It takes into account the sun's and moon's position, moon phase, solar cycle and contains a scattering model of the atmosphere. Our mission is to explore, explain, and sustain life. Often good seeing occurs during poor transparency. Keep tabs on our planets with Morrison Planetarium's quarterly guide to planetary activity. The Academy will be open Thanksgiving Day (11/26) from 10 am-3 pm and will be open until 6 pm on 11/27-28. At the same time, as its distance increases, it appears to shrink in size. To view this site, enable JavaScript by changing your browser options and try again. But they have 984 forecast maps. which Hold your mouse over a block to explain color and details. So it may "explain colors when you mouse over" to interpret the colors. that goes from today's sunset to tomorrow's sunrise. Large globulars and planets can be observed in poor The Moon joins Jupiter (and Saturn), forming a compact cluster with them on the evenings of October 22, November 18, and (as a very thin, waxing crescent) December 16. Camera sensors will have reduced noise. Your guide to the Solar System and the night sky. Copyright 2020 A. Danko. more celestial bodies. and are approximated with an error that could be as large as few minutes. The two largest naked-eye planets are so close together that practically everything pertaining to observation of one also applies to the other. (Local time for San Francisco is -8.0 hours from GMT.). calculations page. mostly-clear forecasts (cloud<25%) have been right 80% of the time. here. with an instrument smaller than 11 inches. You may also observe better seeing than predicted here when observing The Moon passes near Mars on the evenings of October 2, October 29, November 25, and December 23. Accuracy averaged over North America and the last 30 days: when the forecast is predicting less than 12 hours into the future, Unfortunately, the But, in general, electronics have a lowest temperature at which they will work. tube currents Being closest to the Sun, Mercury has the shortest orbital period, so its fast-changing motions are easiest to see among the planets. hours to be less accurate. will be the map closest to the hour you picked.

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