About TPE

TPE for Desktop Web App

The Photographer's Ephemeris ®

The Photographer's Ephemeris (TPE) helps plan outdoor photography shoots in natural light, particularly landscape and urban scenes. It’s a map-centric sun and moon calculator: see how the light will fall on the land, day or night, for any location on earth.

Created for photographers by a photographer in 2009, TPE is a software tool available for desktop and mobile devices to help you plan outdoor photography shoots to ensure the best possible natural light.


TPE was conceived in 2008, following a weekend landscape photography course in Rocky Mountain National Park, Colorado. After a classroom session that required use of paper-based topographic maps, protractor, calculator, pencil and ruler, it seemed like an equivalent digital tool built on internet mapping services might be something whose time had come.

The original TPE for Desktop (an Adobe AIR application) was released in beta in March 2009, and quickly found a following online. An iPhone app was released in April 2010, and was expanded to include a dedicated user interface for iPad tablets later that year. TPE for Android was released in November 2011.

In September 2014, the original TPE for Desktop was replaced by a modern, browser-based web app. The new app supports all the features of the original, but offers the opportunity for much easier integration and linking with other apps in the TPE family and beyond.

Our iOS app reached version 3.0 in early 2015, and has been enhanced significantly over the past year to include Location Synchronisation (for both iOS and the web app), Skyfire, Night Mode, and more.

We’ve also improved integration with TPE’s sister app The Photographer’s Transit, a digital field of view and shot planning application. The Photographer’s Transit is available on both iPhone and iPad as of version 2.0, released in December 2015.

Since its original release, TPE in its various versions has been used by hundreds of thousands of photographers, both amateur and professional, in over 200 countries.

Stephen Trainor recently recorded an episode for Fred Weymouth’s Lens and Landscape podcast, which includes much of the history and background to TPE:

The Future

We look forward to continuing to update the applications and to seeing how planning your shot helps deliver great results for photographers around the world.

TPE has become the premier tool for outdoor photographers planning shots in natural light. Please check out the links below to see how TPE is being used by photographers today.

We welcome your feedback on TPE. Please e-mail support@photoephemeris.com with your comments and questions.

TPE is published by Crookneck Consulting LLC. You can find out more about us and our other projects, plus contact details, at crookneckapps.com.

“The Photographer’s Ephemeris” is a registered trademark of Crookneck Consulting LLC.

Available Editions

TPE for Desktop is a free browser-based web application, available at: app.photoephemeris.com.

TPE for iOS is available for purchase on the App Store.

TPE for Android is available via Google Play.

Media, web-site owners, bloggers

If you’d like to write about TPE or would like to review the product, we’re happy to help. Please contact support@photoephemeris.com with any specific questions or requirements.

Media Resources

Get it on Google Play


Product shots with screenshots showing TPE 3.3 for iOS with Skyfire overlaid on standard Apple product imagery for press/media use
File size 8.49MB | Last modified Sun Aug 2, 2015 at 14:55 | Download count 1017

Product shots showing TPE 3.3 for iOS with Skyfire running on actual devices, for press/media use.
File size 5.14MB | Last modified Wed Jul 29, 2015 at 14:42 | Download count 639

Screenshots of Skyfire for TPE on iPhone 6 and iPad.
File size 8.47MB | Last modified Thu Jul 30, 2015 at 10:13 | Download count 680

File size 16.31MB | Last modified Tue Feb 10, 2015 at 10:40 | Download count 397

File size 1.98MB | Last modified Tue Feb 10, 2015 at 10:41 | Download count 516

File size 2.56MB | Last modified Tue Feb 10, 2015 at 10:45 | Download count 510

File size 5.57MB | Last modified Tue Feb 10, 2015 at 10:55 | Download count 426

Photographs of iPhone 6, iPhone 6+ and iPad Air running TPE 3.0, shot against a natural wood background.
File size 18.91MB | Last modified Tue Feb 10, 2015 at 23:11 | Download count 292

Photographs of iPhone 6 and iPhone 6+ running TPE 3.0, with devices held in hand, shot against natural wood background.
File size 15.40MB | Last modified Tue Feb 10, 2015 at 23:14 | Download count 293

TPE screenshots on Apple standard product images. Includes iPad, iPhone 6, iPhone 6+, iPhone 5, plus combinations of iPad and iPhone
File size 1.64MB | Last modified Tue Feb 10, 2015 at 23:21 | Download count 443

File size 11.10MB | Last modified Sun Jul 6, 2014 at 16:26 | Download count 900

File size 6.12MB | Last modified Fri Feb 15, 2013 at 15:29 | Download count 824

File size 12.60MB | Last modified Wed Oct 31, 2012 at 11:43 | Download count 385

Promo Codes

We can send reviewers a promo code for TPE for iOS (subject to availability). Please e-mail support@photoephemeris.com with details of your request.


Do you publish your own web-site? If so, you can earn up to 7% commission on sales of iPhone and iPad Apps, including TPE on iOS. Find out how to apply at the link below:

Apple iTunes Affiliates

Getting set up is straightforward and you can be earning additional revenue within 24 hours.

TPE around the web

A selection of writing and articles about TPE from around the web:

Adorama Camera – The Photographer’s Ephemeris is way cool
Alex Wise Photography – Calculate sunset direction and its time through this tool..
BestAppSite – 5/5 Get it. This is a quality application that has been very thoughtfully and carefully designed.
Brent Pearson’s Photo Journey – A Great Tool For Photographers!
Bruce Percy – The Photographer’s Ephemeris for iPhone
Bruce Percy – The Photographer’s Ephemeris
Caborian – The Photographer’s Ephemeris: Imprescindible para el Paisajista
Digitale Fotografie Tips – Photographer’s Ephemeris, plan het beste moment
Digital Photo – October Skies—11/02/09
Digital Photography School – It’s all about the light: The Photographer’s Ephemeris
fotografia – The Photographer’s Ephemeris, todos los detalles sobre la salida y puesta de sol
Nature Photographers Network – Review of The Photographer’s Ephemeris
Kruger-2-Kalahari – Of all Landscape Photography Tools, The Photographer’s Ephemeris is a must!
National Geographic – Photo Gallery: Photographing the Night Sky
National Geographic – Tracking the Moon
National Geographic – Extreme Photo of the Week
Olaf Bathke – Tolle Iphone App für Fotografen: The Photographer’s Ephemeris
Outdoor Photographer – Shooting Waterfalls
Outdoor Photographer – The Photographer’s Ephemeris
Outdoor Photographer – The Photographer’s iPhone Edge
Outdoor Photographer – X Marks The Spot
PhotoNaturalist.net – Free Software for Landscape Photographers
PhotoNaturalist.net – Photographer’s Ephemeris now available for iPhone
Thom Hogan – Be a Calculating Photographer
Thom Hogan – Teaching Points: Look the Other Way
Tim Parkin – Using the Internet to Scout a Location

TPE 3.0 on iPhone 6+ held in hand

Site Credits and Acknowledgements

Subtle Patterns (Subtle Patterns) / CC BY-SA 3.0


The Photographer’s Ephemeris is a registered trademark of Crookneck Consulting LLC.