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Light calculator (table form)

 

I made this calculator because I always want a paper with me on longer trips with times for sunrise/sunset, night, moonrise/set, etc. The output table is plain text, which can be copied into a text editing program and printed if needed. However, before printing, it needs to be converted in the text editing program to a monospaced font (Courier works fine) and downsized to fit on the page. The script with the moon calculations is courtesy of Peter Hayes, used with permission.

 

Definitions:

• Day:

• Sunrise/sunset:

• Civil twilight:

• Nautical twilight:

• Astronomical twilight:

• Night:

Solar latitude is more than -0.833°.*

Solar latitude is -0.833°.

Solar latitude is between -0.833° and -6°.

Solar latitude is between -6° and -12°.

Solar latitude is between -12° and -18°.

Solar latitude is below -18°.

 

* About 0.25° of this is due to the suns radius and about 0.6° is due to atmospheric refraction. Atmospheric refraction is the bending of light when it travels through our atmosphere, and close to the horizon it is about 0.6°. Since the sun is about 0.5° in diameter, it means that, when we see the bottom of the sun touching the horizon, the sun is in reality already below the horizon!

 

Year/month/day (today):

/ /

Latitude (°)*:

Longitude (°)**:

Time zone ***:

Days:

Daylight saving time:

* North of the equator is positive, south of the equator is negative.

** East of Greenwich is positive, west of Greenwich is negative.

*** Fill in the time zone relative to UTC (overview). Examples: Hawaii is -10, the UK is 0, CET is +1, New Zealand is +12.

 

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||    DATE    ||NIGHT|       TWILIGHT        |  DAY  |       TWILIGHT        |NIGHT||            MOON            ||     HOURS     ||

||            ||     | astr. | naut. | civil |       | civil | naut. | astr. |     || (-- = moon is up) || phase ||  day  | night ||

||------------||-----|-------|-------|-------|-------|-------|-------|-------|-----||-------------------||-------||-------|-------||

||--------------------------------------------------------------------------------------------------------------------------------||