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Algol normally shines at magnitude 2.1, similar to the nearby star Almach (aka Gamma Andromedae). But while fully dimmed, Algol's brightness of magnitude 3.4 is almost identical to Rho Persei (or Gorgonea Tertia or ρ Per), the star sitting just two finger widths to Algol's lower right (or 2.25 degrees to the celestial south). As darkness falls on Sunday evening, the pretty, 44%-illuminated crescent moon will shine a generous fist's diameter (11 degrees) to the lower right of yellowish Saturn in the southern sky. When the moon sets a short time before 11 p.m. local time, it will be below Saturn and a little closer to it. For a short time after sunset on Tuesday, Nov. 14, just above the southwestern horizon, the very slender crescent of the young moon will shine several finger-widths to the left (or four degrees to the celestial southeast) of Mercury. (Image credit: Chris Vaughan/Starry Night) it Is Ideal For Wearing During The Day And During The Night And Is A Wonderful Option For the Whole Year. For a short time after sunset on Tuesday, Nov. 14, just above the southwestern horizon, the very slender crescent of the young moon will shine several finger-widths to the left (or four degrees to the celestial southeast) of Mercury. That will make them close enough to share the view in binoculars (orange circle), but delay your search until the sun has completely set.
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On Saturday evening, Nov. 4 at 6:56 p.m. EDT or 22:56 GMT, Algol will be at its minimum brightness. At that time it will be located in the lower part of the northeastern sky. Five hours later the star will return to full intensity from a perch nearly overhead. Observers in more westerly time zones can see the latter stages of the brightening. On Saturday evening, Nov. 18, the terminator boundary between the moon's lit and dark hemispheres will fall just to the left of a trio of large craters named Theophilus, Cyrillus, and Catharina that curve along the western edge of gray Mare Nectaris. (Image credit: Chris Vaughan/Starry Night) The northeastern sky on November evenings hosts the bright constellations of Perseus and W-shaped Cassiopeia, with the very bright star Capella positioned below them. On Wednesday evening, Nov. 29, sky-watchers east of the Mountain Time zone will have a special treat as the shadow of Io leads the Great Red Spot across Jupiter. (Image credit: Chris Vaughan/Starry Night) In a telescope, the planet will display a half-illuminated phase and an apparent disk diameter of 22 arc-seconds. With each passing day, Venus will slowly increase in illuminated phase, shrink in size, and diminish in brightness.On Monday, Nov. 13 Uranus will reach opposition — the night of the year when it is closest to Earth at a distance of 1.74 billion miles, 2.78 billion km, or 155 light-minutes. (Image credit: Chris Vaughan/Starry Night) Over the month, Saturn's brightness will diminish a little from magnitude 0.7 to 0.85. Viewed in a telescope during November Saturn will show an apparent disk diameter of 17.4 arc-seconds, and its rings will span nearly 41 arc-seconds. In the western sky on Tuesday evening, Nov. 28, the very bright star Vega in the constellation of Lyra the Harp will be descending the western sky. (Image credit: Chris Vaughan/Starry Night) The star Algol in the constellation of Perseus represents the glowing eye of Medusa from Greek mythology. Also designated Beta Persei, it is among the most accessible variable stars for skywatchers.
Night sky, October 2023: What you can see tonight [maps] Night sky, October 2023: What you can see tonight [maps]
The northeastern sky on November evenings hosts the bright constellations of Perseus and W-shaped Cassiopeia, with the very bright star Capella positioned below them. (Image credit: Chris Vaughan/Starry Night)
That corresponds to six by two full moon diameters! In a dark sky, M31 can be seen with your unaided eyes as a sizeable faint smudge located 1.4 fist diameters to the lower left (or 14 degrees to the celestial northeast) of Alpheratz, the star that occupies the lower left (northeastern) corner of the Great Square of Pegasus. The three higher (westernmost) stars of Cassiopeia, named Caph, Shedar, and Gamma Cas, also conveniently form an arrow that points toward M31. On Wednesday evening, Nov. 29, sky-watchers east of the Mountain Time zone will have a special treat as the shadow of Io leads the Great Red Spot across Jupiter. At 5 p.m. EST (or 10:00 GMT) Io will begin to cross Jupiter — but its position alongside a dark belt will make seeing that moon difficult.
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