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Important! Please read the Notes section.
This page provides a way for you to obtain a table of the duration of daylight or darkness for any year between 1700 and 2100.
You can obtain a table for any location worldwide by following these simple steps:
- Decide on which form to use. If you want a table for cities or towns in the U.S. or its territories, use Form A below. For other locations, use Form B below.
- Enter the year (1700 - 2100) for which the table is desired.
- Select the table type (daylight or darkness) from the pop-up list in the form that you are using.
- Specify the location of interest using the fields provided on the form.
- Click the "Compute Table" button at the end of the form to compute the table. The table will provide the data requested in hours:minutes format.
- Be sure to read Notes section (on this page beyond the two forms) for an explanation of the items in the table.
Form A - U.S. Cities or Towns
Specify year, type of table, and place:
Form B - Locations Worldwide
Specify year, type of table, and place:
Notes
Explanation
The Duration of Daylight table provides, for each calendar date, the total time that any portion of the Sun is above the horizon. Typically (for low and mid-latitude locations), this will be the elapsed time beginning at sunrise and ending at sunset.
The Duration of Darkness table provides, for each calendar date, the total time that the entire Sun is below the horizon. Typically (for low and mid-latitude locations), this will be the sum of two elapsed times: the time beginning at local midnight and ending at sunrise, and the time beginning at sunset and ending at local midnight.
For definitions of sunrise and sunset, see Rise, Set, and Twilight Definitions in our FAQ area.
For an explanation of why there is generally more daylight than darkness during the equinoxes (and all year at the equator), see Length of Day and Night at the Equinoxes and Comparative Lengths of Days and Nights.
Time Zones
For U.S. locations (Form A), phenomena times are presented in the standard time of the place requested, using the current time zone of that place. Standardized time zones were introduced in the U.S. in 1883, but the time zone boundaries have evolved considerably since then, with places shifting from one zone to another. This service makes no attempt to track such changes.
For worldwide locations (Form B) that require it, the time zone can be entered in hours and a fraction. For example, for locations in India, the time zone may be entered as 5.5 hours east of Greenwich. The time zone field can accommodate up to five characters.
How to Print the Table
The table is 112 characters wide, so to print it you must use landscape orientation and 8-point (smallest) type. Consult your browser's documentation for details on how to change the font/text size. An alternative scheme is to save the table to a file on your computer (for example, in Internet Explorer, click on Page then Save As...), then use your favorite word processor or text editor to print it.
How to Import the Table into a Spreadsheet
Open your favorite text editor, then copy the numerical part of the table (i.e., do not copy the table headings) from your browser and paste it into the text editor. Save the data as a text file.
In Excel for Windows, select Data on the menu bar, then From Text. Select your saved text file. Choose fixed width in the dialog box.
In Excel for Mac, select Data on the menu bar, then Get External Data, then Import from Text File. Select your saved text file. Choose fixed width in the dialog box.