Discover Top Posts Tagged with #sun clock

ragusa ibla / sicily series 149

#ragusa ibla #lensblr #lensculture #fine art photography #photographers on tumblr #sun clock #sicily #italy

A brass ring dial or mariner's sun clock. English circa 1790.

The universal ring dial could be used on land or at sea to obtain local solar time by knowing only the date and latitude without the use of a compass.

#naval navigation #ring dial #18th century #sun clock #age of sail

Basel - 2017 - Basler Münster (2) (3) (4) by Richard Melton

Via Flickr:

(4) Roof and sun clock.

#churches #romanesque architecture #gothic architecture #tiles #sun clock #switzerland #basel-stadt

A 24-hour clock that shows sunrise, sunset, golden hour, and twilight times for your current location

#sun #sunset #interesting #sun clock

Solar physicists around the world have long been searching for satisfactory explanations for the sun's many cyclical, overlapping activity fluctuations. In addition to the most famous, approximately 11-year "Schwabe cycle", the sun also exhibits longer fluctuations, ranging from hundreds to thousands of years. It follows, for example, the "Gleissberg cycle" (about 85 years), the "Suess-de Vries cycle" (about 200 years) and the quasi-cycle of "Bond events" (about 1500 years), each named after their discoverers. It is undisputed that the solar magnetic field controls these activity fluctuations.