In one of the existing models of sundials, their plane is inclined so that the axis is directed not vertically upwards, but towards the North Pole of the world. What advantages and disadvantages of this scheme can you point out? At what latitudes of the Earth is it better to use such a clock?
This watch has one very important advantage over the usual, horizontal sundial: the diurnal path of the Sun will be parallel to the plane of the watch, and the “hand” – the shadow from the central axis – will rotate evenly around the dial, and the clock will be more accurate. This is especially important for tropical and temperate latitudes, where the Sun’s diurnal path is strongly inclined to the horizon, and the horizontal clock will have a noticeable error. However, this watch is not without its drawbacks. In particular, in the astronomical autumn and winter, this watch can be used only by looking at it from below, by installing another axis there, which, you must agree, is not very convenient. But in our latitudes, it is often impossible to use sundials in autumn and winter for other obvious reasons.
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