RTLT
Definition
Noun: * Round-Trip Light Time: The precise measurement of the total time required for an electromagnetic signal (such as a radio wave) to travel from a point of origin on Earth to a distant target (like a spacecraft or celestial body) and then for its echo or reply to return to the original starting point.
Usage
- Noun:
- Mission controllers must account for the RTLT when sending commands to distant probes; there is a significant delay before they receive confirmation.
- The increasing RTLT to Mars as it orbits farther from Earth complicates real-time operation of rovers.
Advanced Usage
- Acronym Expansion: While "rtlt" is the common written form (an initialism), the full term "round-trip light time" is used in formal technical writing and speech.
- Scientific Context: RTLT is a fundamental concept in planetary science, astronomy, and deep-space communications. It is directly proportional to the distance to the target object (distance = (speed of light * RTLT) / 2).
Variants and Related Words
- One-Way Light Time (OWLT): The elapsed time for a signal to travel just from the sender to the receiver (half of the RTLT).
- Light-Time Delay / Communications Delay: A more general descriptive term for the phenomenon caused by RTLT.
- Signal Propagation Time: A broader technical term that includes RTLT.
Synonyms
- Round-trip delay
- Two-way light time
Related Phrases
- To account for RTLT: To factor the communication delay into planning and operations.
- Engineers had to account for the 40-minute RTLT when programming the landing sequence.
- An RTLT of [time period]: The standard phrasing to state the measured duration.
- At its closest approach, the Moon has an RTLT of approximately 2.6 seconds.
Noun
-
the elapsed time it takes for a signal to travel from Earth to a spacecraft (or other body) and back to the starting point
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