lookback time

noun

The amount of time elapsed between the moment that light is detected on Earth and the moment it was originally emitted by the source.

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Meanings

noun
  1. astronomyThe amount of time elapsed between the moment that light is detected on Earth and the moment it was originally emitted by the source.
Cite this entry
APA

lookback time. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/lookback%20time

MLA

“lookback time.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/lookback%20time. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “lookback time,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/lookback%20time.

Source: lookback time on Wiktionary, CC BY-SA 4.0.