SLA_RVEROT
RV Corrn to Earth Centre
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ACTION:
- Velocity component in a given direction due to Earth rotation.
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CALL:
R = sla_RVEROT (PHI, RA, DA, ST)
GIVEN:
| PHI | R | geodetic latitude of observing station (radians) |
| |
| RA,DA | R | apparent (radians) |
| |
| ST | R | local apparent sidereal time (radians) |
| |
RETURNED:
| sla_RVEROT | R | Component of Earth rotation in direction
[RA,DA] (km s) |
| |
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NOTES:
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(1)
- Sign convention: the result is positive when the observatory is receding from the
given point on the sky.
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(2)
- Accuracy: the simple algorithm used assumes a spherical Earth and an observing
station at sea level; for actual observing sites, the error is unlikely to be greater than
0.0005 km s.
For applications requiring greater accuracy, use the routine sla_PVOBS.