Henrietta Swan Leavitt

This chart holds two T-squares and both can be used, which is unusual, because both run through the Moon and her Moon's sign is certain at eleven degrees of Capricorn. Water takes four of her ten planets, fire three, earth two and a single one air, with six of the ten cardinal and a single mutable. The record says Leavitt found the relationship between a Cepheid variable's period and its brightness, which is how anybody measures distance in the universe, and that Hubble used it to show the universe is expanding.

The Sun sits conjunct Uranus at under a fifth of a degree, and the reading is the self as the thing that will not conform: originality, difficulty with any hierarchy, and somebody who would rather be free than comfortable. Originality is the clause the record settles. Finding the one relation that turned a photographic plate into a measuring stick for the universe is original by any standard, and the record adds that somebody else used it to answer the largest question then available.

The Sun also sits square Jupiter at six hundredths of a degree, the second tightest contact here, and that reading is belief in one's own scale meeting a limit: over-promising, over-extending, and the particular discomfort of having been confident in public and wrong. She was not wrong. The relation held, it is still in use, and the discomfort in that record belongs to the astronomers who took a while to notice. Where a chart offers confident wrongness to somebody who was confidently right, the record is the side with the evidence.

Mars sits in mild friction with Neptune at four hundredths of a degree, the tightest contact of all, will without direction: tiredness with no cause, and action undermined by uncertainty, which in a working life spent measuring thousands of variable stars is the least plausible reading on offer. Jupiter sits square Uranus at a quarter of a degree, which is the apex pair of both T-squares. Saturn sits on the last degree of Scorpio, and Mercury, Venus and Saturn were the three retrograde planets. She died at Cambridge on 12 December 1921, at fifty three. Nothing came inside three tenths of a degree of a natal planet that day. The Moon was gibbous and ninety three per cent lit, a phase that refines, questions and improves, and rarely calls anything finished.