explain the fully concept of sextant
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A sextant is a doubly reflecting navigation instrument used to measure altitude or the
angle between any two visible objects. Sextant is one of the oldest navigation instruments used by mariners, its called sextant because its arc is 1/6th of a circle i.e. 60° but it can measure angles upto 120° using double reflection principle.
Types of Sextant
Micrometer Sextant
Vernier Sextant
Comparison between the types of Sextants
*Construction and operating principle of both sextants are same. In both sextants, whole degrees are read on the arc of the sextant.
* The only difference lies in the way the fraction of a degree are read.
* As the name suggests, in vernier sextant, it is read by the vernier whereas in Micrometer sextant, it is read on the micrometer screw.
*Currently, vernier sextants are rarely used.
*On the micrometer drum, a degree may be divided into 100 parts or 60 parts.
*The fraction of a degree therefore can either be read in 1/100th of a degree, or up to 1/60th of a degree (which comes to one minute of arc)....
_________________________
_________________________
A sextant is a doubly reflecting navigation instrument used to measure altitude or the
angle between any two visible objects. Sextant is one of the oldest navigation instruments used by mariners, its called sextant because its arc is 1/6th of a circle i.e. 60° but it can measure angles upto 120° using double reflection principle.
Types of Sextant
Micrometer Sextant
Vernier Sextant
Comparison between the types of Sextants
*Construction and operating principle of both sextants are same. In both sextants, whole degrees are read on the arc of the sextant.
* The only difference lies in the way the fraction of a degree are read.
* As the name suggests, in vernier sextant, it is read by the vernier whereas in Micrometer sextant, it is read on the micrometer screw.
*Currently, vernier sextants are rarely used.
*On the micrometer drum, a degree may be divided into 100 parts or 60 parts.
*The fraction of a degree therefore can either be read in 1/100th of a degree, or up to 1/60th of a degree (which comes to one minute of arc)....
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Answer:
the angle of inclination of earth in the sky during Midday can be determined by a simple instrument called sextant the angle of inclination maybe also obtained approximately by studying the length of the shadow of a pole fixed on the ground
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