(United States Naval Observatory)
(observatory obtaining astronomical data for Naval use)
The USNO (United States Naval Observatory)
is the USA's research facility to collect astronomical
data for use by the Navy and other branches of the military.
Navies (and sea travel in general) have needed accurate astronomical
data for centuries and such navy-related observatories are
The USNO has carried out extensive astrometric surveys
producing catalogs (e.g., NOMAD)
and also measures and collates accurate and precise data about the Earth's
position, about time, about the expected positions of the Sun
and Moon, and about daylight, i.e., when and where it is present
over the Earth.
The USNO was established at a site in Washington, D.C.,
(Washington Naval Observatory, abbreviated WNO)
but its sizable telescopes are now at a less-urban site
(United States Naval Observatory Flagstaff Station, NOFS)
near Flagstaff, Arizona, for less light pollution.
Telescopes at Flagstaff:
- Kaj Strand Telescope (1.5-mm reflector).
- 1.3-meter reflector.
- 1.0-meter reflector.
- FASTT for Flagstaff Astrometric Scanning Transit Telescope - 8 inch.
|Prefix||Example|| || |
|USNO||USNO 689||star parallax list|| |
|USNO-A||USNO-A2.0 0825-18396733||astrometric catalog edition|| |
|USNO-B||USNO-B1.0 1047-0021596||astrometric catalog edition|| |
Referenced by pages:
Astrographic Catalog (AC)
plate measuring machine (APM)
double star designation
Navy Precision Optical Interferometer (NPOI)
photographic zenith tube (PZT)
USNO CCD Astrograph Catalog (UCAC)
USNO Twin Astrograph
Washington Double Star Catalog (WDS)
XZ Catalog of Zodiacal Stars (XZ)