Lunar Eclipse Computer: U.S. Cities and Towns

This form is for U.S. cities and towns only.  For all other locations, in the U.S. or worldwide, specify the latitude and longitude using this form. You can obtain the circumstances of recent and upcoming lunar eclipses by following these simple steps:

• Select the eclipse from the first pop-up list.
• Specify the location, using the fields provided in the form.
• Click the "Get data" button at the end of the form to compute a table of local circumstances.
• Be sure to read Notes on the Data (at the end of the form) for an explanation of the items in the table.

For general information on eclipse circumstances and visibility, see Upcoming Eclipses of the Sun and Moon.

Notes on the Data:

The place name you enter above must be a city or town in the U.S. The place's location will be retrieved from a file with over 22,000 places listed. Either upper- or lower-case letters or a combination can be used. Spell out place name prefixes, as in "East Orange", "Fort Lauderdale", "Mount Vernon", etc. The only exception is "St.", which is entered as an abbreviation with a period, as in "St. Louis". You need only enter as many characters as will unambiguously identify the place.

The table of local circumstances gives the local time of each eclipse "event" that is visible from the location. The times are the same as those published in The Astronomical Almanac, adjusted to the specified time zone. The altitude and azimuth of the Moon at each of the events is given as well. The azimuth is reckoned eastward from North. The altitude is corrected for refraction assuming standard atmospheric conditions.

The table also gives the time of moonrise immediately preceding, and the time of moonset immediately following, the eclipse. At high latitudes, either or both of these times may be missing from the table. The accuracy of the rise/set times decreases as the latitude approaches +/- 90 degrees. For information on the definitions of terms used, see Rise, Set, and Twilight Definitions.

The times of all events are presented in the standard time of the place requested, using the current time zone of the place . Daylight time is applied when and where appropriate.

If you need to check the times of sunrise and sunset around the time of the eclipse, see Complete Sun and Moon Data for One Day.