spherapy

module util.epoch_u

Utility functions for converting different epochs.

Attributes:

• GMST_epoch: [description]

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function epoch2datetime

epoch2datetime(epoch_str: str) → datetime

Converts a fractional epoch string to a datetime object.

Args: epoch_str: fractional year epoch

Returns: equivalent datetime

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function epochEarlierThan

epochEarlierThan(epoch_a: str, epoch_b: str) → bool

Check if epoch A is earlier than epoch B.

Args:

• epoch_a: TLE epoch string A
• epoch_b: TLE epoch string B

Returns: True if epoch A is earlier than epoch B

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function epochLaterThan

epochLaterThan(epoch_a: str, epoch_b: str) → bool

Check if epoch A is later than epoch B.

Args:

• epoch_a: TLE epoch string A
• epoch_b: TLE epoch string B

Returns: True if epoch A is later than epoch B

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function datetime2TLEepoch

datetime2TLEepoch(date: datetime) → str

Converts a datetime to a TLE epoch string.

Args:

• date: Datetime object

Returns: TLE epoch string, with fractional seconds

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function datetime2sgp4epoch

datetime2sgp4epoch(date: datetime) → float

Converts a datetime to an sgp4 epoch.

Args:

• date: Datetime object

Returns: SGP4 epoch, with fractional seconds

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function findClosestDatetimeIndices

findClosestDatetimeIndices(
    test_arr: ndarray[tuple[int], dtype[datetime64]],
    source_arr: ndarray[tuple[int], dtype[datetime64]]
) → ndarray[tuple[int], dtype[int64]]

Find the index of the closest datetime in source arr for each datetime in test_arr.

Both search_arr and source_arr must be sorted.

Args:

• test_arr: Mx1 array of datetimes, will find closest time for each element in this array
• source_arr: Nx1: array of datetimes to compare to

Returns: Mx1 array of indices of source_arr

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function getStoredEpochs

getStoredEpochs(tle_path: Path) → None | tuple[datetime, datetime | None]

Return the start and end epoch for tle_path.

Args:

• tle_path: tle file

Returns: (first epoch datetime, last epoch datetime) None if no spacetrack tle stored for sat_id

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