EJNAR HERTZSPRUNG

[EJNAR HERTZSPRUNG @ejnar27ejnar]

I also found that the magnitudes and the colors of the member stars formed a narrow sequence, a result later to be corroborated by modern photoelectric observations 🤶🏿

[EJNAR HERTZSPRUNG @ejnar27ejnar]

Before leaving Copenhagen, I photographed several clusters at the Urania Observatory, using coarse gratings in front of the objective of the telescope.🥴

[EJNAR HERTZSPRUNG @ejnar27ejnar]

During this early period of my astronomical career I published two now classic papers in Zeitschrift für wissenschaftliche Photographie 👨🏽‍🦲

[EJNAR HERTZSPRUNG @ejnar27ejnar]

I was elected to eleven academies and societies in both Europe and the United States, and received honorary doctorates from Utrecht (1923), Copenhagen (1946), and Paris (1947)🥳

[EJNAR HERTZSPRUNG @ejnar27ejnar]

My father, Severin Hertzsprung, had a graduate degree in astronomy from the University of Copenhagen but, for financial reasons, decided to accept a position in the Department of Finances of the Danish government and at a very early age became director of insurance🧐

[EJNAR HERTZSPRUNG @ejnar27ejnar]

In 1909 I noticed that two other stars, in widely separated regions of the sky, had motions directed toward the same convergent point of the sky as the five bright stars🔭

[EJNAR HERTZSPRUNG @ejnar27ejnar]

🤌🏼😩

[EJNAR HERTZSPRUNG @ejnar27ejnar]

@NeilsAstronomy Happy Birthday G

[EJNAR HERTZSPRUNG @ejnar27ejnar]

@cos_mologist04 What’s up George🧒🏽

[EJNAR HERTZSPRUNG @ejnar27ejnar]

@cos_mologist04 How did you type that if your dead?

[EJNAR HERTZSPRUNG @ejnar27ejnar]

@NeilsAstronomy Me too, so fascinating

[EJNAR HERTZSPRUNG @ejnar27ejnar]

@NeilsAstronomy Wow that is so cool but no I did not know she was into physics👍

[EJNAR HERTZSPRUNG @ejnar27ejnar]

In my opinion the separation of the c- and ac-stars is the most important advancement in stellar classification since the trials by Vogel and Secchi ... To neglect the c-properties in classifying stellar spectra.
-Ejnar Hertzsprung🥶

[EJNAR HERTZSPRUNG @ejnar27ejnar]

Did you know that more energy from the sun hits Earth every hour than the planet uses in a year???🪐

[EJNAR HERTZSPRUNG @ejnar27ejnar]

Did you know that 99 percent of our solar system's mass is the sun???☀️

[EJNAR HERTZSPRUNG @ejnar27ejnar]

Did you know the Apollo astronauts' footprints on the moon will probably stay there for at least 100 million years???🌙

[EJNAR HERTZSPRUNG @ejnar27ejnar]

Did you know that space is completely quiet???🔭

[EJNAR HERTZSPRUNG @ejnar27ejnar]

Did you know that Neutron stars can spin at a rate of 600 rotations per second???🤯

[EJNAR HERTZSPRUNG @ejnar27ejnar]

In 1913 I determined the distances to several Cepheid variable stars by parallax, and was able to calibrate the relationship, discovered by Henrietta Leavitt, between Cepheid period and luminosity. 😏

[EJNAR HERTZSPRUNG @ejnar27ejnar]

Perhaps my greatest contribution to astronomy was the development of a classification system for stars to divide them by spectral type, stage in their development, and luminosity. 🤌🏼