imap_processing.spice.time.et_to_ttj2000ns#
- imap_processing.spice.time.et_to_ttj2000ns(et: ArrayLike) NDArray[float]#
Convert TDB J2000 epoch seconds to TT J2000 epoch nanoseconds.
Opposite of ttj2000ns_to_et.
- Parameters:
et (float, numpy.ndarray) – Number of seconds since the J2000 epoch in the TDB timescale.
- Returns:
Number of nanoseconds since the J2000 epoch in the TT timescale.
- Return type: