Variance between time of sunset over the year, 2026
?The hover card shows the location as code: name; its
latitude and longitude (city centre, degrees); and a pole scale, which
is latitude on a linear scale with the equator at 0, the North Pole at
+1, the South Pole at −1 (latitude / 90). The map itself is drawn
at the selected city's sunset instant on the selected date: sunset line
through the selected dot, dimmed band to civil dusk, full night beyond.
map:
The Sunshine Protection Act is US federal law;
it moves no clock here. This view is identical to the civil clock.
shading:
Sunrise and sunset, daily*
Dates in this list are MM/DD.
Daylight swing vs latitude
Annual amplitude of daylight length (longest minus
shortest day) against absolute latitude, all 38 locations. Longitude has
no say in the swing; it only slides the clock underneath (the
Kolkata-Mumbai spread). Click a point to switch location.
Any latitude
The same shaded year chart at an arbitrary latitude, on
local mean solar time (no zone, no DST, sun highest at 12:00 minus the
equation of time). Slide to explore; polar day and night appear beyond
the circles.
?
Two slider modes: absolute latitude in degrees (0–90, northern
hemisphere), or the pole scale, latitude / 90, running −1 (South
Pole) through 0 (equator) to +1 (North Pole), linear. The readout shows
pole value first, exact degrees in parentheses. The chart uses local
mean solar time, so it is pure astronomy: no time zone, no DST, no
longitude. Closest major city is nearest by signed latitude among the
38 locations in this almanac.