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Shadows is a software package for the calculation and drawing of sundials and astrolabes, available as a freeware in its base level.. It has been developed by François Blateyron, software developer and amateur astronomer, who made it available on Internet since 1997 and continues to improve it. [1]
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In the Northern Hemisphere, rough alignment can be done by visually aligning the axis of the telescope mount with Polaris.In the Southern hemisphere or places where Polaris is not visible, a rough alignment can be performed by ensuring the mount is level, adjusting the latitude adjustment pointer to match the observer's latitude, and aligning the axis of the mount with true south or north by ...
A sundial schema uses a compass and a straight edge to firstly derive the essential angles for that latitude, then to use this to draw the hourlines on the dial plate. In modern terminology this would mean that graphical techniques were used to derive sin x {\displaystyle \sin x} and m tan y {\displaystyle m\tan y} and from it sin x ...
Analemmatic sundial on a meridian line in the garden of the Herkenrode Abbey in Hasselt (Flanders in Belgium) Analemmatic sundial in which the Barbate lighthouse forms the gnomon of the dial. Analemmatic sundials are a type of horizontal sundial that has a vertical gnomon and hour markers positioned in an elliptical pattern. The gnomon is not ...
The MarsDial can function as a gnomon, the stick or other vertical part of a sundial. [2] [3] The length and direction of the shadow cast by the stick allows observers to calculate the time of day. [2] The sundial can also be used to tell which way is North, and to overcome the limitations of a magnetic north different from a true north. [2]
A sundial schema uses a compass and a straight edge to firstly to derive the essential angles for that latitude, then to use this to draw the hourlines on the dial plate. In modern terminology this would mean that graphical techniques were used to derive sin x {\displaystyle \sin x} and m tan y {\displaystyle m\tan y} and from it sin ...
A shepherd's dial (also known as a pillar dial or cylinder) is a type of sundial that measures the height of the sun via the so-called umbra versa. [1] Its design needs to incorporate a fixed latitude, but it is small and portable. It is named after Pyrenean shepherds, who would trace such a sundial on their staffs. This type of sundial was ...