1 (number)

: This article discusses the number one. For the year AD 1, see 1. For other uses of 1, see 1 (disambiguation)

In science

One is:

~ ~ ~ ~ ~ ~ ~ ~ ~ ~

• set equal to celerity (c), the speed of light, in Heaviside notation to simplify calculations.
• the factor in ratios for unit conversions.
• the total density ratio for a flat universe.
• The atomic number of hydrogen

In astronomy,

~ ~ ~ ~ ~ ~ ~ ~ ~ ~

: Messier object M1, a magnitude 7.0 supernova remnant in the constellation Taurus, also known as the Crab Nebula.

Related Topics:
Messier object - Supernova - Taurus - Crab Nebula

~ ~ ~ ~ ~ ~ ~ ~ ~ ~

: The New General Catalogue object NGC 1, a 13th magnitude 13 spiral galaxy in the constellation Pegasus

Related Topics:
New General Catalogue - NGC 1 - Magnitude - Spiral galaxy - Constellation - Pegasus

~ ~ ~ ~ ~ ~ ~ ~ ~ ~

:The Saros number of the solar eclipse series which began on -2872 June 4 and ended on -1592 July 11 . The duration of Saros series 1 was 1280.1 years, and it contained 73 solar eclipses.

Related Topics:
Saros - Solar eclipse - -2872 - June 4 - -1592 - July 11

~ ~ ~ ~ ~ ~ ~ ~ ~ ~

:The Saros number of the lunar eclipse series which began on -2588 March 2 and ended on -1272 April 30. The duration of Saros series 1 was 1316.2 years, and it contained 74 lunar eclipses.

Related Topics:
Lunar eclipse - -2588 - March 2 - -1272 - April 30

~ ~ ~ ~ ~ ~ ~ ~ ~ ~