Update, May 13 Where Is My Picture? Contributors who haven’t found their pictures in the gallery (be sure you’ve looked under “All”) may resubmit. Attach a JPEG file, no larger than 5MB, to an e-mail message with your name, location and caption. Write “Moment” in the subject line. Your picture should have been taken at 15:00 U.T.C. on Sunday, May 2. Resubmit only the image you originally sent; nothing new. We apologize and thank you for your patience. Pictures: pix@nyt.com Where Is My Credit? Contributors whose pictures have been published without credit should send an e-mail message with their name and the URL of their picture. (It’s a long one, beginning www.nytimes.com and ending with a string of two dozen numbers and letters.) Again, please accept our apologies. Credits: lensnytimes@gmail.com

Update, May 17 | It is now possible to search the “Moment in Time” interactive gallery by the name given in the photographer’s credit line (actual name, pseudonym or screen name, as the contributor chose). You’ll find the search box in the upper right corner of the opening page. If you believe your picture wasn’t posted, we urge you to give this a try.

Update, May 11 | The interactive gallery is now open.

Updated | Our invitation elicited countless promises of participation and some important questions, many of which we tried to answer on April 20 in “Photographers Prepare for a Moment in May.” We were also set straight on the local time in Beijing, which we’ve now fixed.

Original post | Where will you be on Sunday, May 2, at 15:00 hours (U.T.C.)?

Wherever you are, we hope you’ll have a camera — or a camera phone — in hand. And we hope you’ll be taking a picture to send to Lens that will capture this singular instant in whatever way you think would add to a marvelous global mosaic; a Web-built image of one moment in time across the world.

We extend the invitation to everyone, everywhere. Amateurs. Students. Pros. People who’ve been photographing for a lifetime or who just started yesterday.

What matters more than technique is the thought behind the picture, because you’ll only be sending us one. So please do think beforehand about where you will want to be and what you will want to focus on. Here are the general topics:

Religion

Play

Nature and the Environment

Family

Work

Arts and Entertainment

Money and the Economy

Community

Social Issues

Setting Your Clock Day and Night World Map Much of the populated world is in daylight at 15:00 (U.T.C.). Timeanddate.com

In New York, it will be 11 o’clock on Sunday morning when the clock for Coordinated Universal Time — which carries the neither-English-nor-French abbreviation U.T.C. (it’s formerly Greenwich Mean Time) — reaches 15:00 hours. So some people will be settled into church pews while others prepare to head out to the park, if not the beach. Los Angeles will be a good deal quieter at such an early hour, except for some hard-partying types unwilling to concede that it’s no longer Saturday night. Lunch time will be at hand in Rio de Janeiro, dinner time in Cape Town. Dusk will be bringing an end to another tough day in Afghanistan, while midnight will be an hour away in Beijing. For Australians, it will already be first thing Monday morning.

After you take your photo, please send it as soon as possible to submit.nytimes.com/moment (the link should be active at 15:00 U.T.C.). On the Web form, you’ll be asked to categorize your photo by location and subject (the topic list shown above) and to include caption information. We don’t expect everyone to hit 15:00 exactly, but we do ask that you try to stay within a few minutes of that targeted time.

The photos will appear quickly on the Lens blog and on NYTimes.com, and — if you’d like — you’ll be able to arrange them by country, by topic or by how they were ranked by other readers. Or you can just view them randomly. Some will almost certainly be spotlighted on the Lens blog.