Definition

1. Noun:
   • Spacecraft clock time: The specific time measurement provided by a dedicated clock onboard a spacecraft. This time is independent of Earth-based timekeeping systems and is crucial for synchronizing spacecraft operations, data logging, and communication.

Usage

• Noun:
  • The onboard computer uses the sclk to timestamp every piece of scientific data.
  • Mission control must convert the received sclk values to Earth time for analysis.
  • A discrepancy was found between the sclk and the ground-based mission elapsed time.

Advanced Usage

• "Sclk correlation": The process of mapping or converting spacecraft clock time to another time standard (like UTC or mission elapsed time).

  • The engineering team performed an sclk correlation to align the instrument data with the command sequence.

• "Sclk string" / "Sclk value": The specific numerical or alphanumeric output representing a moment in spacecraft clock time.

  • The telemetry packet header contains the sclk value marking its creation.

Variants and Related Words

• SCLK: A common acronym for "Spacecraft Clock Time." It is often written in uppercase.

  • The data file is indexed by SCLK.

• Onboard clock: A more general term for the timing hardware inside a spacecraft or satellite.

• Mission elapsed time (MET): Another spacecraft timekeeping system that counts time from launch, often used in conjunction with or converted from SCLK.

Synonyms

• Spacecraft time
• Onboard time

Notes

• Sclk is a specialized technical term used almost exclusively in the context of aerospace engineering, space mission operations, and astronomy.
• It is not a standard unit like seconds or hours, but a counter specific to each spacecraft's clock, which may tick at a unique rate.

Noun

1. the clock time given by a clock carried on board a spacecraft