File:Vertical sundial solstice declination lines.gif
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English: Vertical sundial declination lines for summer (red), winter (blue) solstices and equinoxes (magenta) at various latitudes (lat). The sundial faces due south in the Northern Hemisphere and due north in the Southern Hemisphere. g is for the base of the gnomon, h is for the gnomon style and the sundial face intersection point, e is for the eccentricity of solstice lines. Gnomon length was taken equal to one. For the winter solstice line we have only an arc of the conic section, its remaining part cannot be traced, as then the Sun is below the horizon. For hyperbolas (e>1) I've performed a verification using a formula from this book. Русский: Линии, вдоль которых движется тень от верхушки гномона вертикальных солнечных часов в дни зимнего (синяя), летнего (красная) солнцестояний и равноденствий (фиолетовая) для разных широт (lat). Кадран обращён на север в Южном и на юг в Северном полушарии. g — основание гномона, h — точка пересечения кадрана и гипотенузы гномона, e — эксцентриситет линий для солнцестояний. Для зимнего солнцестояния мы имеем только дугу конического сечения, остальная часть не может быть пройдена тенью, т.к. тогда Солнце под горизонтом. Две маленькие точки — фокусы линий для солнцестояний. Длина горизонтального катета гномона равна единице. |
| Date | |
| Source | Own work |
| Author | Cmapm |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 20:51, 18 January 2013 | | 400 × 400 (462 KB) | Cmapm (talk | contribs) | User created page with UploadWizard |
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