You can obtain the circumstances of recent and upcoming lunar eclipses for any location by following these simple steps:
- Decide on which form below to use. If you want local circumstances for cities or towns in the U.S. or its territories, use Form A. For other locations, use Form B.
- Select the eclipse from the first pop-up list in the form that you are using.
- 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 (on this page beyond the two forms) 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.
Form A - U.S. Cities or Towns
Form B - Locations Worldwide
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 (Form A), or the specified zone (Form B). Daylight time is applied to times for places in the U.S. (Form A) when and where appropriate.
More information on eclipses can be found at the USNO Eclipse Portal.
For U.S. locations (Form A), phenomena times are presented in the standard time or daylight time (see below) 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.
In accordance with the Uniform Time Act of 1966 and subsequent legislation, daylight time (DST) is implemented only for U.S. locations (Form A) from 1967 to the present day. Daylight time is not used for places currently exempt from it.