New Moon

New Moon. By the modern definition, New Moon occurs when the Moon and Sun are at the same geocentric ecliptic longitude. The part of the Moon facing us is completely […]

V. Ambartsumian, theoretical astrophysicist, d. 1996

Viktor Amazaspovich Ambartsumian was a Soviet Armenian astrophysicist and science administrator. One of the 20th century's top astronomers, he is widely regarded as the founder of theoretical astrophysics in the Soviet Union.

Perseids Meteor Shower

The Perseids are the most popular meteor shower as they peak on warm August nights as seen from the northern hemisphere. The Perseids are active from July 17 to August 24, peaking on August 12 - 13.

Assumption of the Blessed Virgin Mary

The Assumption of the Blessed Virgin Mary is, according to the beliefs of numerous Churches, the bodily taking up of Mary, the mother of Jesus, into Heaven at the end of her earthly life. The analogous feast […]

Moon at Perigee

Every month, the Moon’s eccentric orbit carries it to perigee, the Moon’s closest point to Earth in its orbit – then 2 weeks later, to apogee, its most distant point from Earth.

Conjunction of Mercury and Mars

Mars and Mercury will be less than a degree apart in the sky - this may be VERY difficult to view with the naked eye due to their proximity to […]

Jupiter at Opposition

Jupiter will be in opposition to the Sun on this date; this is when the Earth is positioned between the Sun and Jupiter.

Full Moon

The Full Moon rises at sunset, is visible all night, and is high in the sky around midnight.

Hermann von Helmholtz, polymath, b.1821

Hermann Ludwig Ferdinand von Helmholtz (31 August 1821 – 8 September 1894) was a German physicist and physician who made significant contributions in several scientific fields. The largest German association of research institutions, the Helmholtz Association, is […]

John H. Chapman, Canadian space scientist, b. 1921

John Herbert Chapman (August 28, 1921 – September 28, 1979) was a Canadian space researcher. He started his career with his work on radio propagation and the ionosphere. Chapman was a member of the Royal Society of […]