Östen Bergstrand
Encyclopedia
Carl Östen Emanuel Bergstrand (September 1, 1873 – September 27, 1948) was a Swedish
astronomer
.
He was Professor of Astronomy at Uppsala University
from 1909 until 1938. His early work was focused on astrometrics
, particularly in the examination of photographic plates to measure stellar parallax
. He used the orbital motions of the moons of Uranus
to measure the rotation period and equatorial flattening of the planet. He also made studies of the solar corona, using photographs from the 1914 solar eclipse expedition.
He wrote works on astronomy for the general public, including Astronomi (1925).
The crater Bergstrand
on the Moon
is named after him.
Sweden
Sweden , officially the Kingdom of Sweden , is a Nordic country on the Scandinavian Peninsula in Northern Europe. Sweden borders with Norway and Finland and is connected to Denmark by a bridge-tunnel across the Öresund....
astronomer
Astronomer
An astronomer is a scientist who studies celestial bodies such as planets, stars and galaxies.Historically, astronomy was more concerned with the classification and description of phenomena in the sky, while astrophysics attempted to explain these phenomena and the differences between them using...
.
He was Professor of Astronomy at Uppsala University
Uppsala University
Uppsala University is a research university in Uppsala, Sweden, and is the oldest university in Scandinavia, founded in 1477. It consistently ranks among the best universities in Northern Europe in international rankings and is generally considered one of the most prestigious institutions of...
from 1909 until 1938. His early work was focused on astrometrics
Astrometry
Astrometry is the branch of astronomy that involves precise measurements of the positions and movements of stars and other celestial bodies. The information obtained by astrometric measurements provides information on the kinematics and physical origin of our Solar System and our Galaxy, the Milky...
, particularly in the examination of photographic plates to measure stellar parallax
Parallax
Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines. The term is derived from the Greek παράλλαξις , meaning "alteration"...
. He used the orbital motions of the moons of Uranus
Uranus
Uranus is the seventh planet from the Sun. It has the third-largest planetary radius and fourth-largest planetary mass in the Solar System. It is named after the ancient Greek deity of the sky Uranus , the father of Cronus and grandfather of Zeus...
to measure the rotation period and equatorial flattening of the planet. He also made studies of the solar corona, using photographs from the 1914 solar eclipse expedition.
He wrote works on astronomy for the general public, including Astronomi (1925).
The crater Bergstrand
Bergstrand (crater)
Bergstrand is a lunar impact crater that lies on the far side of the Moon. It is located just to the southeast of the prominent crater Aitken, and northeast of the walled plain Vertregt....
on the Moon
Moon
The Moon is Earth's only known natural satellite,There are a number of near-Earth asteroids including 3753 Cruithne that are co-orbital with Earth: their orbits bring them close to Earth for periods of time but then alter in the long term . These are quasi-satellites and not true moons. For more...
is named after him.