SLA_EPCO
Convert Epoch to B or J
-
ACTION:
- Convert an epoch to Besselian or Julian to match another one.
-
CALL:
D = sla_EPCO (K0, K, E)
GIVEN:
| K0 | C | form of result: ‘B’=Besselian, ‘J’=Julian |
| |
| K | C | form of given epoch: ‘B’ or ‘J’ |
| |
| E | D | epoch |
| |
RETURNED:
| sla_EPCO | D | the given epoch converted as necessary |
| |
-
NOTES:
-
-
(1)
- The result is always either equal to or very close to the given epoch E. The routine
is required only in applications where punctilious treatment of heterogeneous
mixtures of star positions is necessary.
-
(2)
- K0 and K are not validated. They are interpreted as follows:
- If K0 and K are the same, the result is E.
- If K0 is ‘B’ and K isn’t, the conversion is J to B.
- In all other cases, the conversion is B to J.