NarrowHighway

A card from a free library — ask anything, no account, works offline. Every card carries its source.

The running day-count astronomers keep

physical

Astronomers count time in Julian days — an unbroken tally of days. Noon on 1 January 2000 is Julian day 2,451,545, the modern epoch J2000. Worked & sealed by the engine — JD(2000-01-01) = 2,451,545. [HOLDS; open the seal to re-check.]

source
The Works — worked & sealed ↗
card id
card_works_julian_day

related in the keeping ↗ · its seal ↗ · raw JSON ↗

adjoining cards

Is this card incomplete? Tell the library — it will call out for more ↗