Ole Rømer

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Galaxy clusters like Abell 2744 can act as a natural cosmic lens, magnifying light from more distant, background objects through gravity. NASA's James Webb Space Telescope may be able to detect light from the first stars in the universe if they are gravitationally lensed by such clusters. (astronomy, space exploration, galaxies)

How Fast Is the Universe Expanding?

Planet Jupiter with its moon Io at left, photographed by the Cassini orbiter during the Cassini-Huygens mission, 2000. spacecraft

7 Important Dates in Jupiter History

Planet Earth and lunar moon from space

Where Did the Moon Come From?

Copenhagen, Denmark. May 7 2019 - Grundtvig's church.The rare example of expressionist church architecture.

5 Landmark Buildings in Copenhagen

solar eclipse, sun, moon, astronomy, space

How Do You Tell the Difference Between Total, Annular, Solar, and Lunar Eclipses?

Discover

An ancient egyptian hieroglyphic painted carving showing the falcon headed god Horus seated on a throne and holding a golden fly whisk. Before him are the Pharoah Seti and the goddess Isis. Interior wall of the temple to Osiris at Abydos, Egypt.

11 Egyptian Gods and Goddesses

Mona Lisa, oil on wood panel by Leonardo da Vinci, c. 1503-06; in the Louvre, Paris, France. 77 x 53 cm.

Why Is the Mona Lisa So Famous?

A Factory Interior, watercolor, pen and gray ink, graphite, and white goache on wove paper by unknown artist, c. 1871-91; in the Yale Center for British Art. Industrial Revolution England

Inventors and Inventions of the Industrial Revolution

Small, white rat (genus Rattus) on a glass table. (rodent, laboratory, experiment)

Cruel and Unusual Punishments: 15 Types of Torture

Flamingo. (flamingos, birds)

Why Are Flamingos Pink?

Shadow of a man holding large knife in his hand inside of some dark, spooky buiding

7 of History's Most Notorious Serial Killers

The Battle of New Orleans, by E. Percy Moran, c. 1910. Andrew Jackson, War of 1812.

26 Decade-Defining Events in U.S. History

Ole Rømer: References & Edit History

More Articles On This Topic

Assorted References

development of astronomical transit instruments
- In telescope: Astronomical transit instruments
history of astronomy
- In astronomy: Herschel and the Milky Way
influence on Bradley
- In James Bradley
use of data compiled by Cassini
- In Gian Domenico Cassini

study of

Jupiter’s satellites
- In eclipse: Eclipses, occultations, and transits of satellites and other objects
light speed
- In electromagnetic radiation: Speed of light
- In light: Early particle and wave theories

Article Contributors

Primary Contributors

The Editors of Encyclopaedia Britannica

Other Encyclopedia Britannica Contributors

Article History

Type	Description	Contributor	Date
	First paragraph modernization.	Encyclopaedia Britannica	Apr 18, 2024
	Anniversary information added.		Sep 21, 2023
	Anniversary information added.		Sep 19, 2023
	Replaced media.	Amy Tikkanen	May 07, 2020
	Deleted Web site: Rýmer and the Doppler Principle.	Yamini Chauhan	May 22, 2013
	Article updated.	Erik Gregersen	Feb 26, 2009
	Added new Web site: The Galileo Project - Biography of Roemer, Ole Christensen.	Kanchan Gupta	Jun 23, 2008
	Article added to new online database.	The Editors of Encyclopaedia Britannica	Jul 20, 1998