Astronomy - USA 2021-04)
WWW.ASTRONOMY.COM 41 within a 20'-wide circle. The brightest member — a magnitude 9 orange star — sits near the cluster’s center ...
42 ASTRONOMY • APRIL 2021 for observing Limb darkening is evident in this image of the Sun viewed through a simple Coronado Pers ...
Whether using a telescope or binoculars, solar filters can help you view the Sun in its best possible light. BY PHIL HARRINGTON ...
Flare Flares are sudden releases of energy stored in sunspot magnetic fields. Coronal mass ejection Billion-ton clouds of charge ...
WWW.ASTRONOMY.COM 45 AS THE MOON SLOWLY ENCROACHES on the Sun during an eclipse, use a white- light filter and carefully view th ...
46 ASTRONOMY • APRIL 2021 Hα filters for amateur instru- ments, as well as dedicated Hα telescopes. That’s fortunate, since this ...
WWW.ASTRONOMY.COM 47 Though most were unable to see last year’s total solar eclipse in person, local astronomers and websites ca ...
48 ASTRONOMY • APRIL 2021 But it isn’t just the objects around the Sun that draw astronomers to view eclipses. Scientists still ...
WWW.ASTRONOMY.COM 49 the Sun’s corona would look like. These computations were based on observations from NASA’s Solar Dynamics ...
50 ASTRONOMY • APRIL 2021 COVID-19 restrictions, they were unable to cross into Argentina to find a new observing site. Instead, ...
WWW.ASTRONOMY.COM 51 mean we aren’t already planning to collect more in the future, as the Sun continues through its sunspot cyc ...
Blancanus Scheiner Longomontanus Purbach Thebit Thebit A Rupes Recta Birt Rima Birt Nicollet ArzachelArzachel 52 ASTRONOMY • APR ...
Clavius Porter RutherfurdRutherfurd Mare Imbrium Montes Teneriffe Vallis Alpes Montes Alpes Plato Bliss Protagoras Archytas Mare ...
You don’t have to spend a lot to get a child interested in the sky. BY MICHAEL E. BAKICH TTHE BEST HE BEST ...
WWW.ASTRONOMY.COM 55 MY INTEREST IN ASTRONOMY began in third grade, when my parents bought me a set of constellation f lash card ...
56 ASTRONOMY • APRIL 2021 CELESTRON INSPIRE 100AZ REFRACTOR that 11th-magnitude galaxy have two or three arms?” When you’re show ...
57 be tiny. You can increase the magnifica- tion, but that will reduce the time the planet remains in view. Luckily, kids’ eyes ...
_ ` a ` Denebola 12 14 16 17 13 21 COMA BERENICES LEO N W 5° Melotte 111 a 12 14 16 17 13 21 58 ASTRONOMY • APRIL 2021 BINOCULAR ...
M A R K E T P L A C E Alcon 2021 ..................................59 Astronaut in a Box ...........................61 Astro-Phy ...
30,000 25,000 20,000 15,000 10,000 5,000 0 Kelvins A A O O F F G G K K M M B B 60 ASTRONOMY • APRIL 2021 OBSERVING BASICS This m ...
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