Ejnar Hertzsprung (October 8, 1873, Copenhagen – October 21, 1967, Roskilde) was a Danish chemist and astronomer. October 8 is the 281st day of the year (282nd in leap years). ... 1873 was a common year starting on Wednesday (see link for calendar). ... Copenhagen (Danish: København) is the capital and largest city of Denmark. ... October 21 is the 294th day of the year (295th in leap years) in the Gregorian Calendar, with 71 days remaining. ... 1967 was a common year starting on Sunday of the Gregorian calendar. ... Roskilde (population 52,572) is an ancient city in Denmark, situated in the island of Zealand, 30 km west of Copenhagen. ... Chemistry (in Greek: χημεία) is the science of matter that deals with the composition, structure, and properties of substances and with the transformations that they undergo. ... In ancient Greece and other early civilizations, astronomy consisted largely of astrometry, measuring positions of stars and planets in the sky. ...

Along with Henry Norris Russell, he developed the Hertzsprung-Russell diagram (1910). Henry Norris Russell (October 25, 1877 – February 18, 1957) was a US astronomer who, along with Ejnar Hertzsprung, developed the Hertzsprung-Russell diagram (1910). ... In stellar astronomy, the Hertzsprung-Russell diagram (usually referred to by the abbreviation H-R diagram or HRD) shows the relationship between absolute magnitude, luminosity, stellar classification, and surface temperature. ... 1910 in topic: Arts Architecture- Art- Film- Literature- Music- Television Science and technology Aviation- Rail transport- Radio- Science Other topics Australia- Canada- Ireland- South Africa- Sport Births- Deaths Lists of leaders: State leaders - Religious leaders 1910 was a common year starting on Saturday (see link for calendar). ...

He discovered two asteroids, one of which is the Amor asteroid 1627 Ivar. An asteroid is a small, solid object in our Solar System, orbiting the Sun. ... The Amor asteroids are a group of near-Earth asteroids named after the asteroid 1221 Amor. ...

An asteroid is a small, solid object in our Solar System, orbiting the Sun. ... September 25 is the 268th day of the year (269th in leap years). ... 1929 was a common year starting on Tuesday (link will take you to calendar). ... July 7 is the 188th day of the year (189th in leap years) in the Gregorian Calendar, with 177 days remaining. ... 1924 was a leap year starting on Tuesday (link will take you to calendar). ...

Honors

Awards

• Gold Medal of the Royal Astronomical Society in 1929
• Bruce Medal in 1937.

Named for him The Gold Medal is the highest award of the Royal Astronomical Society. ... 1929 was a common year starting on Tuesday (link will take you to calendar). ... The Catherine Wolfe Bruce gold medal is awarded every year by the Astronomical Society of the Pacific for outstanding lifetime contributions to astronomy. ... 1937 was a common year starting on Friday (link will take you to calendar). ...

• Hertzsprung crater on the Moon.
• Asteroid 1693 Hertzsprung.

Hertzsprung is an enormous lunar crater that is located on the far side of the Moon, beyond the western limb. ... Crust composition Oxygen 43% Silicon 21% Aluminium 10% Calcium 9% Iron 9% Magnesium 5% Titanium 2% Nickel 0. ... An asteroid is a small, solid object in our Solar System, orbiting the Sun. ...

External links

• Bruce Medal page
• Awarding of Bruce Medal: PASP 49 (1937) 65
• Awarding of RAS gold medal: MNRAS 89 (1929) 404

Obituaries

• AN 290 (1968) 287 (one line, in German)
• AN 291 (1969) 85 (in German)
• JRASC 62 (1968) 137
• Obs 87 (1967) 298 (one line)
• PASP 79 (1967) 638 (one line)
• PASP 80 (1968) 50 (not online)
• QJRAS 9 (1968) 337