2006年7月25日 · Technically known as parhelia (singular parhelion) they are often white but sometimes quite colorful, looking like detached pieces of rainbow, with red on the inside, toward the Sun, and blue on the outside. A Sun halo, a circle of light that creates a circle 22° wide around the Sun, is a related phenomenon. As with sundogs, hexagonal ice ...

2022年3月23日 · If you could swap locations and look back at the Sun from Procyon, our star would appear quite a bit dimmer than Procyon, since the Sun is cooler and doesn’t emit as much light. From Procyon, the Sun would appear at magnitude 2.6. The different viewing angle distorts the shapes of Aquila and Delphinus, too. Celestia, with additions by Bob King

2020年3月19日 · Dazzling Dog Star All the objects highlighted in this article are shown in this chart. Stellarium, with additions by S&T. Also known as the Dog Star, Sirius is the night sky’s brightest sun. Obviously, you don’t need binoculars to appreciate such a conspicuous object, but there’s definitely something appealing about seeing Sirius's ...

2018年3月27日 · Unlike our Sun, Sirius isn’t alone. It’s a member of a binary system, and its companion is a tiny (smaller than Earth!) white dwarf star named Sirius B, or more playfully, “The Pup.” Though it has about the Sun’s mass, the Pup has shrunk to less than the size of Earth, making it an incredibly dense object.

2025年2月21日 · Now March pushes him westward and spotlights his dog, Canis Major with Sirius on his chest, standing center stage on the meridian. Sirius is not only the brightest star in our sky after the Sun, it's also the closest naked-eye star after the Sun, at 8.6 light-years, for those of us living at mid-northern latitudes.

2014年7月15日 · The brightest star in the sky is Sirius, also known as the “Dog Star” or, more officially, Alpha Canis Majoris, for its position in the constellation Canis Major. Sirius is a binary star dominated by a luminous main sequence star, Sirius A, with an apparent magnitude of -1.46. Sirius A’s apparent brightness can be attributed both to its ...

2017年3月29日 · A few years back in 2008, the Pup and Dog Star were considerably closer. This image illustrates how diffraction spikes can sometimes get in the way of the star and make it impossible to see even on an ideal night. Sirius B is smaller than Earth but 98% as massive as the Sun. A 150-pound person standing on its surface would weigh 50 million pounds!

2024年12月20日 · The solstice occurs at 4:20 a.m. EST, when the Sun reaches its farthest south declination and begins its six-month return northward. At sunrise I will be with a crowd of fellow oddballs from church singing up the Sun by a lakeside, just so it doesn't forget to begin its return. You can thank us for the coming spring and summer. Works every year.

2016年8月10日 · Heat, humidity, the searing Sun. Must be the Dog Days of summer. This hottest time of year runs from mid-July to mid-August in the northern hemisphere. Despite the image of dogs sleeping off the heat during endless afternoons, the canine association has naught to do with pups and all to do with the heliacal rising of the star Sirius.

2024年2月23日 · The Pup is east-northeast of the Dog Star and 10 magnitudes fainter: one ten-thousandth as bright. As Bob recommends, put a homemade occulting bar across your eyepiece's field stop: a tiny strip of aluminum foil held to the field stop with a bit of tape, with one edge crossing the center of the field.