The sky over Georgetown, Guyana, from sunset to full dark on 15 October 2026: civil, nautical and astronomical twilight, and why near the equator it is over in about 70 minutes all year.
Shows Georgetown (6.80° N, 58.16° W), facing west, 15 Oct 2026 from sunset to astronomical dusk, Guyana time; the same ladder on the 15th of each month of 2027.
A silent 30-second explainer drawn from the site’s own sky chart. It speeds through one evening over Georgetown, Guyana, facing west, from sunset to full dark, pausing where each twilight ends.
15 October 2026, Guyana time: sunset 17:37; civil dusk 17:59 (21 minutes after sunset); nautical dusk 18:23 (45 minutes after sunset); astronomical dusk 18:47 (70 minutes after sunset). The Sun is 6°, 12° and 18° below the horizon at the three dusks. The waxing crescent Moon (25% lit) hangs in the west.
Sunset to full dark on the 15th of each month of 2027: Jan 74 min, Feb 71 min, Mar 69 min, Apr 71 min, May 74 min, Jun 76 min, Jul 75 min, Aug 72 min, Sep 69 min, Oct 70 min, Nov 73 min, Dec 75 min.
Stars are drawn brighter-first as the sky darkens, to about magnitude 1.5 at civil dusk, 3.5 at nautical dusk and 5 at full dark: a rule of thumb for a clear, dark site. Planets within 12° of the Sun are left out, lost in its glare.
0:00 How long after sunset is it really dark? Watch one evening over Georgetown, sped up.
0:03 17:37 GYT: the Sun’s top edge touches the western horizon. The sky is still bright.
0:09 17:59, 21 minutes after sunset: the Sun is 6° down. The crescent Moon and the brightest stars show.
0:15 18:23, 45 minutes after sunset: 12° down. The horizon fades and most bright stars are out.
0:21 18:47, 70 minutes after sunset: 18° down. Astronomical twilight is over; faint objects come through.
0:25 Near the equator the Sun drops almost straight down, so on the 15th of every month of 2027 full dark comes 69 to 76 minutes after sunset.
0:30 Plan dark-sky work from astronomical dusk: sunset plus about an hour and ten minutes in Guyana.