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Almanac  10/18/2021


24hr Day / Night Clock


Sun DayNite Moon age: 12 days, 5 hours, 43 minutes,96%
Sunrise: 08:30
Sunset: 19:48
Daylight for: 11:18 hours
Daylight (Sun's upper edge at horizon)
Civil twilight (Sun's centre 6° below horizon)
Nautical twilight (Sun's centre 12° below horizon)
Astronomical twilight (Sun's centre 18° below horizon)
Night time
"Hour Hand" (rotates counter clockwise)
Times are Mountain Standard Time (GMT -7) all year long!
Moonset: 06:36
Moonrise: 19:13

12 days old - 96% illum.

Civil twilight: defined to begin in the morning, and to end in the evening when the center of the Sun is geometrically 6 degrees below the horizon. This is the limit at which twilight illumination is sufficient, under good weather conditions, for terrestrial objects to be clearly distinguished; at the beginning of morning civil twilight, or end of evening civil twilight, the horizon is clearly defined and the brightest stars are visible under good atmospheric conditions in the absence of moonlight or other illumination. In the morning before the beginning of civil twilight and in the evening after the end of civil twilight, artificial illumination is normally required to carry on ordinary outdoor activities.
Nautical twilight: defined to begin in the morning, and to end in the evening, when the center of the sun is geometrically 12 degrees below the horizon. At the beginning or end of nautical twilight, under good atmospheric conditions and in the absence of other illumination, general outlines of ground objects may be distinguishable, but detailed outdoor operations are not possible. During nautical twilight the illumination level is such that the horizon is still visible even on a Moonless night allowing mariners to take reliable star sights for navigational purposes, hence the name.
Astronomical twilight: defined to begin in the morning, and to end in the evening when the center of the Sun is geometrically 18 degrees below the horizon. Before the beginning of astronomical twilight in the morning and after the end of astronomical twilight in the evening, scattered light from the Sun is less than that from starlight and other natural sources. For a considerable interval after the beginning of morning twilight and before the end of evening twilight, sky illumination is so faint that it is practically imperceptible.

First Quarter Moon Full Moon Last Quarter Moon Next New Moon
First Quarter Moon Full Moon Last Quarter Moon New Moon
10/12/2021 10:25pm
13 October 2021 03:25 GMT
10/20/2021 9:57am
20 October 2021 14:57 GMT
10/28/2021 3:05pm
28 October 2021 20:05 GMT
11/04/2021 4:14pm
04 November 2021 21:14 GMT

Vernal Equinox
Start of Spring
Summer Solstice
Start of Summer
Autumn Equinox
Start of Autumn
Winter Solstice
Start of Winter
Start of Spring First day of Summer First day of Fall First day of Winter
03/20/2021 4:37am
20 March 2021 09:37 GMT
06/20/2021 10:32pm
21 June 2021 03:32 GMT
09/22/2021 2:21pm
22 September 2021 19:21 GMT
12/21/2021 9:59am
21 December 2021 15:59 GMT

Sun and Daylight Annual Data

NOTE: Mountain Standard Time is observed all year long in the state of Arizona.
If it makes it any easier, think of Arizona as being in the Pacific Daylight Time zone when DST is in effect.

Sunrise Sunset Graph

Graphs courtesy of ptaff.ca project

Click one of the thumbnail graphs to display it as the large graph.
Sunrise Sunset and
Hours of Daylight
Maximal Sun Altitude Maximal Solar Flux Twilight Length
Sunrise Sunset Graph Sun Altitude Graph Solar Flux Graph Twilight Graph