Although no longer visible in summer's evening sky, there is (appropriately for Corvid Week) a crow among the stars. In the early evening sky of mid-spring, look southeast just after sunset for the small, irregular, four-sided polygon which is the constellation Corvus the Crow. It's located about 15 degrees southwest of the bright star Spica and just above the midpoint of the long, sinuous line of stars forming the faint figure of Hydra the Watersnake.
According to one version of the Greek myth (each legend typically has several variations), Corvus was originally a white bird with a beautiful singing voice. One day, the god Apollo commanded Corvus to fetch a cup of water from a stream; however, instead of doing so immediately, Corvus dallied by the stream to eat figs from a nearby tree. The crow blamed the delay on a water snake, which the god knew was a lie. As punishment, Apollo turned the crow black and changed its voice to a harsh caw. Furthermore, he cursed the crow with eternal thirst and placed it in the sky, chasing Crater the Cup, but never able to drink from it, which is being dragged out of reach in the coils of the wronged Hydra the Watersnake.
Moral of the story: get your own water, Apollo!
But more than being just a character in an ancient fable, Corvus also had a very important function in ancient cultures, playing a part in a phenomenon known as "heliacal rising." Recognized as a reliable method of calendar-keeping throughout history, heliacal rising occurs when an object emerges from the the glow of the Sun, rising just before dawn and washed from view almost immediately in the growing daylight. On its first appearance, it's visible only briefly, but each successive morning, it remains visible longer and longer. Because of the regularity of Earth's orbit about the Sun, our star's apparent position against the background stars is also very regular, causing a given object's heliacal rising to take place on the same date each year.
For the Egyptians, the helical rising of the star Sirius (which they called Sothis) occurred just before the annual flooding of the Nile River, which irrigated farmlands along the banks.
For the Babylonians, Corvus was Mul Uga Mushen, a heavenly raven associated with Adad, the god of rain and storms, and its heliacal rising —the first appearance of the raven-foretold the start of the coming of autumn rains.
Corvus is a small constellation in the southern sky, nestling to the south of Virgo. Visually, it appears as a trapezoid of second and third magnitude stars not far from Spica, which appears highest in the evening sky in the months around March.
Most of the objects of interest in Corvus are faint. It is home to the merging galaxies NGC 4038 and NGC 4039, collectively known as Arp 244 or the Antennae galaxies. Near the center of the trapezoid lies the tenth-magnitude planetary nebula NGC 4361, sometimes known as the cosmic water sprinkler.
Early Arab astronomers perceived the constellation as a camel and a tent. The Greek poet Aratus mentions Corvus in his work ‘Phaenomena’ from the 3rd century bc. Ptolemy, the great astronomer who lived and worked in Egypt during the 2nd century ad, was the first person to catalog Corvus. The Romans gave the constellation its present name.
_
After reading about Corvus, I feel that it is one of the smallest yet most meaningful constellations in the night sky.
What makes Corvus remarkable is not its brightness or size, but the story behind it. In Greek mythology, Corvus was once a white crow with a beautiful singing voice. However, after lying to Apollo, it was transformed into a black bird and condemned to suffer eternal thirst. The image of the crow forever chasing the Cup, yet never able to drink from it, is both tragic and thought-provoking. It serves as a reminder that even a single lie can have lasting consequences, while also reflecting the ancient belief in the importance of honesty and responsibility.
What fascinates me even more is that Corvus is not merely a figure from mythology—it also held real significance for ancient civilizations. For the Babylonians, the heliacal rising of Corvus heralded the arrival of the autumn rains. Like many other ancient cultures, they used the stars as both a calendar and a clock. This demonstrates how people thousands of years ago carefully observed the heavens to guide agriculture, mark the changing seasons, and shape their religious beliefs.
From an astronomical perspective, Corvus is relatively modest, being a small constellation located south of Virgo. Yet within its boundaries lie extraordinary celestial objects, including the Antennae Galaxies (NGC 4038 and NGC 4039) and the planetary nebula NGC 4361. To me, this is a reminder that appearances can be deceiving. Something small and unassuming can still hold remarkable beauty and significance.
Overall, Corvus evokes a sense of mystery and timelessness. It represents the intersection of mythology, history, and science: a crow carrying an enduring moral lesson, a celestial marker that once helped ancient people keep track of the seasons, and a constellation that shelters breathtaking cosmic wonders millions of light-years away. Although it may not be as famous as Orion or Scorpius, Corvus possesses a unique charm that makes it truly worthy of admiration and exploration.
