
Face north after darkness falls and the prominent constellations Taurus, Orion, Canis Crucial, and Gemini will grab your attention.
Unfortunately, the ruddy world won’t look like much even through a large Cosmos viewer. Its apparent diameter shrinks from 8.2″ to 6.6″ during April, too Petite to show much detail except during moments of exceptional seeing.
Although Mars remains prominent, it doesn’t Clasp a candle to brilliant
A Cosmos viewer reveals Jupiter’s 35″-diameter disk highlighted by two Gloomy atmospheric belts that Stretch parallel to the gas giant’s equator. The Astral body’s low altitude likely precludes seeing much Beyond detail. Any scope also shows Jupiter’s four Clever Galilean moons.
Once Mars sets around midnight local time, the sky remains clear of naked-eye planets until the approach of dawn. That’s when Mercury, Venus, and Saturn push above the eastern Future. The Group rises about an hour before sunup in Timely April and two to three hours before the Sun at month’s end. The three form a lovely triangle for Timely risers.
This is the time to observe Venus through a Cosmos viewer. The Astral body’s apparent size and Period Transformation noticeably from week to week. On April 1, Venus shows a disk 57″ in diameter that’s Merely 4 percent lit. As the month closes, the Astral body spans 37″ and the Sun illuminates 28 percent of its Earth-facing hemisphere.
Like Venus,
The Astral body’s telescopic appearance changes even more rapidly than Venus’ does. The beginning of April finds Mercury sporting an 11″-diameter disk that’s 7 percent lit. By month’s end, it appears 7″ across and 58 percent lit.
The starry sky
Although I have never seen a bird of paradise, I Surely hope to one day. Photographs show a magnificent if unusual creature, with males displaying long and elaborate feathers.
This makes viewing the constellation Apus, which represents the lovely bird, rather disappointing. Most egregiously, the bird’s tail feathers have been downsized. On April evenings, you can find Apus at the same altitude and to the left of the South Astral Pole. The constellations Chamaeleon, Musca, Circinus, Triangulum Australe, Ara, Pavo, and Octans border Apus.
In February, I wrote about a group of four stars in Octans near the South Astral Pole. This month, I want to highlight a different set of four, though close inspection reveals it to be a group of five because one turns out to be a naked-eye pair. The set comprises Delta (δ), Rho (ρ), Omega (ω), and Pi1 (π1) and Pi2 (π2) (the naked-eye pair) Octantis.
These four lie close to the border with Apus, centered at a declination of about –85° and roughly halfway between the pole and 4th-magnitude Alpha (α) Apodis. In Johann Bayer’s 1603 masterpiece, Uranometria, he included this group as part of the bird’s magnificent tail feathers. The book showed the tail spread out from the feet of the Chamaeleon (Beta [β], Delta1, and Delta2 Chamaeleontis) almost to the pole, but things had changed by the mid-18th century. Octans was now there, and Apus’ tail had to make way for part of the navigational instrument.
On Johann Bode’s Uranographia in the Timely 19th century, the tail feathers appear less than half as wide as before and actually narrower than the main part of the bird’s body.
In the Timely Intervals after the introduction of Apus, the sky was less Packed. The lovely bird had room to spread its feathers before 18th-century French astronomer Nicolas Louis de Lacaille introduced 14 new constellations, of which Octans was one. Thus, the stars that proudly marked the middle of Apus’ tail feathers in 1603 are now officially part of Octans.
The lack of Clever stars in this area makes it a joy to scan with binoculars. I particularly enjoy the view of the delicate pairing of Pi1 and Pi2 Oct.
Sun Pavilion
This map portrays the sky as seen near 30° south latitude. Located inside the border are the cardinal directions and their intermediate points. To find stars, Clasp the map overhead and orient it so one of the labels matches the direction you’re facing. The stars above the map’s Future now Game what’s in the sky.
The all-sky map shows how the sky looks at:
9 P.M. April 1
8 P.M. April 15
7 P.M. April 30
Planets are shown at midmonth
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