# E3-aircraft

Rows: 2. Files: E3-aircraft.csv, E3-aircraft.json (same rows).
Unit: ns.

Columns:
- value: measured value
- sigma: 1-sigma uncertainty, same unit
- source: publication (authors, journal, volume, page)
- year: year of publication
- provenance: where the lab first read the number (internal notes name the lab record; the primary source is the source column)
- prediction: the authors' own prediction
- prediction_sigma: its 1-sigma uncertainty
- pooled: yes: used in the combined value; no: shown as a cross-check only

Notes from the record:
- E3 clocks flown round the Earth. Quantity: time gained by the flown clocks against the ground clocks, ns. The prediction column is Hafele and Keating's own from their flight logs (gravity plus speed terms of the lab's relation).

Source of the data: the publications in the source column.

Licence: Values are numerical results quoted from the cited publications; the publications themselves remain under their publishers' copyright and licences, and the numbers are reproduced here for scholarly citation, each with its source. This compilation (the selection, the columns and the notes): licence to be set by the author; CC BY 4.0 proposed.

sha256 of E3-aircraft.csv: efbbc9ea1fb1348243419bfab087795619420fd28065140449018e3d2541bda8
Record file last written: 2026-11-07 19:14:10 IST.