The Celestial Return of Leo: A Guide to Spring's Dominant Constellation

The northern hemisphere is currently treated to a spectacular view of the constellation Leo, dominating the spring night sky.

The Sickle Asterism and Regulus

Leo is most easily identified by its distinctive "backwards" question mark, referred to by astronomers as the "sickle" asterism and representing the head of the lion. The constellation's brightest star is Regulus, a brilliant blue-white star that sits almost exactly on the ecliptic, the path traced by the sun, moon and planets across the sky.

Historical and Astronomical Significance

• Antiquity: Recognized since antiquity, it is one of the original 48 constellations listed by Ptolemy in the second century.
• Star Data: Regulus' position on the ecliptic makes it a critical marker for tracking planetary movements.
• Visibility: While visible from the southern hemisphere in the northern sky, it is currently the dominant feature in the northern hemisphere's spring evenings.

Cultural Legacy Across Civilizations

The constellation has a rich mythological tradition that spans thousands of years. In Mesopotamia, it was associated with the lion ridden by the goddess Ishtar, while the ancient Egyptians linked it to the annual flooding of the Nile River, which occurred when the sun passed through this region of the sky.

Best Viewing Times for 2026

For optimal viewing, look high in the southern sky. The chart shows the view looking high in the southern sky from London on 27 April at 22:00 BST, although the view will be essentially the same all week.