alidade वाक्य
उदाहरण वाक्य
मोबाइल
- It is used in conjunction with an alidade, usually positioned 1000 ft ( 304.8 m ) away and wherever possible set at the same level.
- In that case, the observer moved the alidade until the object of interest is centered in the sights and then reads the graduations marked on the arc.
- If observing the sun, it was both safer and easier to allow the shadow of one of the alidade's vanes to be cast onto the opposite vane.
- In the diagram, the openings are exaggerated in size to show the shape; they would be smaller in a real alidade, perhaps 2 mm or so in width.
- However, in 1906, indirect fire goniometric sights were adopted; these consisted of an alidade mounted on a circular scale graduated in degrees that was mounted on the shield.
- The illustration of the Hevelius instrument to the right shows how two persons would use such a sextant : his wife Elisabetha is aligning the instrument while Johannes sets the alidade.
- These instruments included an alidade, dumpy level, theodolite, Gunter's chain ( which was replaced by a steel tape ) and a solar compass or a vernier compass.
- A significant number of stars in the sky, such as Aldebaran and Altair, and astronomical terms such as alidade, azimuth, and almucantar, are still referred to by their Arabic names.
- The measurement is thus limited by the angular accuracy of the instrument and not the sine error of the length of an alidade, as it is in a mariner's astrolabe or similar older instrument.
- A significant number of stars in the sky, such as Aldebaran, Altair and Deneb, and astronomical terms such as alidade, azimuth, and nadir, are still referred to by their Arabic names.
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