Winter solstice one must be able to observe a change in azimuth or elevation less than or equal to about 1/60 of the angular diameter of the sun. Observing that it occurred within a two-day period is easier, requiring an observation precision of only about 1/16 of the angular diameter of the sun. Thus, many observations are of the day of the solstice rather than the instant. This is often done by observing the sunrise and sunset or using an astronomically aligned instrument that allows a ray of light to be cast on a certain point around that time. Length of day
Six Months, Three Days Six Months, Three Days "Six Months, Three Days" is a science fiction novelette by Charlie Jane Anders. It was originally published online on Tor.com in 2011, and was subsequently reprinted in "Some of the Best from Tor.com: 2011 Edition" and "Year's Best SF 17". It won the 2012 Hugo Award for Best Novelette. In October 2017 Tor.com published "Six Months, Three Days" in Anders' short fiction collection, "Six Months, Three Days, Five Others". Doug and Judy are both precognitive: Doug can see "the future", and Judy can see "many possible futures". They fall in love, even though they both know