Skyclock

Skyclock, the sun calculator software, provides sun event information for individuals and organizations that wish to maximize their use of daylight. Planning, safety, and maximizing time outdoors are made easier with the pie-shaped diagram overlaid on an analog clock face.

Skyclock was founded by John Rosevear, a published author, horologist, copyright, and patent holder. A Marine Corps veteran, Rosevear served part of his enlistment aboard the U.S.S. Lexington, where he developed a strong sense of the tactical advantages offered by explicit knowledge of the precise timings of the sun events sunrise, sunset, civil twilight, nautical twilight, and astronomical twilight. The times of these events change every day, and are different for every location.

Skyclock is used by some pilots who have a Sport License, which allows them to fly during the daytime, which the FAA describes as inclusive of civil twilight periods.

Skyclock is used by photographers as an aid to know precisely at a specific location when the sun will be in the desired position.

Skyclock is used by golfers and other outdoor sports enthusiasts to understand specifically how much more daylight is available, as there is further daylight after sunset. It depends, however, on the date and location as to how much additional daylight there will be.

Skyclock had apps in Apple's App Store and Google Play. A new web-based software is available that duplicates the app experience.

There is a free version available, and a paid version for $3.65, which provides further enhancements and features.

Skyclock is made up of John Rosevear, CEO, Rob Baxtresser, President, and Tony Audas, CTO. Skyclock is based in Ann Arbor, Michigan.