“Spring Ahead, Fall Back”

To make the most of SkyandTelescope.com's Almanac and Interactive Sky Chart, you need to specify your location and time zone. You also need to indicate whether daylight saving time ("summer time") is in effect.

Typically you'll need to change the Daylight Saving Time setting twice a year: in the spring when DST goes into effect (and you set your clocks ahead one hour), and in the fall when standard time returns (and you set your clocks back an hour).

Here's an example of what the yellow part of the Almanac bar (at the top of every SkyandTelescope.com page) looks like during standard time:

Almanac bar - Standard Time

And here's an example of how it looks like during daylight saving time:

Almanac bar - Daylight Saving Time

The time-zone offset from Universal Time (UT) is different, and "DST" appears when DST is in effect.

The DST adjustment doesn't happen automatically. You have to do it manually. One way is via the My Observing Location page. To get there, click the "change" button under the words "My location" in the yellow part of the Almanac bar.

After you set your location, you'll see the Choose Time Zone dialog, which looks something like this:

Select your time zone using the pull-down menu. Check or uncheck the Daylight Saving Time box as needed. Then click SUBMIT.

When the page refreshes, you should see the correct time (with or without the DST adjustment, as appropriate) in the Almanac bar. Your settings are saved (in a cookie) for reuse whenever you return to SkyandTelescope.com.

For more about setting your location and time zone, see our Almanac Help or Sky Chart Help pages.

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