Christian Pedersen Horrebow (15 April 1718 – 15 September 1776)[1] was a Danish astronomer of the 18th century. He was a son of Peder Horrebow, whom he succeeded as director of the observatory associated with the University of Copenhagen. He was himself succeeded by Thomas Bugge.
Neith, a supposed moon of Venus, was spotted by Christian Horrebow, while he was studying this planet from 1766 to 1768. He also discovered the periodicity of sunspots.[2][3]
References[edit]
- ^ Hockey, Thomas (2009). The Biographical Encyclopedia of Astronomers. Springer Publishing. ISBN 978-0-387-31022-0. Retrieved August 22, 2012.
- ^ Jørgensen, Carsten Sønderskov; Karoff, Christoffer; Senthamizh Pavai, V.; Arlt, Rainer (2019-06-12). "Christian Horrebow's Sunspot Observations – I. Life and Published Writings". Solar Physics. 294 (6): 77. arXiv:1906.10884. Bibcode:2019SoPh..294...77J. doi:10.1007/s11207-019-1465-z. S2CID 255075791. Retrieved 2022-06-17.
- ^ Karoff, Christoffer; Jørgensen, Carsten Sønderskov; Senthamizh Pavai, V.; Arlt, Rainer (2019-06-12). "Christian Horrebow's Sunspot Observations – II. Construction of a Record of Sunspot Positions". Solar Physics. 294 (6): 77. arXiv:1906.10895. Bibcode:2019SoPh..294...78K. doi:10.1007/s11207-019-1466-y. S2CID 255070410. Retrieved 2022-06-17.
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction