The Photographer's Ephemeris (TPE) application provides detailed information with the exact position of the sun and moon as viewed from a particular location on a on a given date and time. TPE also provides shadow length, and whether or not a subject will be in shade at a given time. Click on the next icon to open The Photographer's Ephemeris centered on the location shown, clicking on the second gives the National Weather Service Point Forecast for the location:
TPE is published by Crookneck Consulting LLC and the web application is free to use.
There are many apps available for your phone or tablet to help with shot planning. My favorites are Photopills and TPE for Android/iOS or TPE 3D for iOS only. Both applications support the importing of Points of Interest / Locations. To import POIs for Vermilion Cliffs into one of these apps proceed as follows:
The Sunrise Sunset calculator above provides a monthly calendar showing Sunrise/Sunset and Moonrise/Moonset and Moon phase for a whole month. More detailed information can be obtained by clicking on one of the Photographer's Ephemeris icons above or via one of the mobile applications listed.
The White Pocket is in Arizona so DST is not observed, i.e. all times shown are in standard time.