What is it called when the position is determined by angles between a star and an accurate time reference?

A)
Sun fix
B)
Celestial fix
C)
Position fix
D)
Horizontal fix

Correct Answer :   Celestial fix

Explanation : Navigators on early transoceanic flights used sextants to manually measure star angle with respect to their local vertical. Using the line of sights form two or more stars, along with a star catalog and accurate time reference, the position in Earth latitude and longitude can be deduced. This was known as celestial fix.

Recently Updated in Avionics Questions
Anti reflection coated optics reduce ________
A)
Refraction
B)
Reflection angle
C)
Intensity of star image
D)
Optical transmission losses

Correct Answer : Option (D) :   Optical transmission losses

Explanation : For anti-reflection coated optics, the optical transmission losses may be 1% or 2% at each air to glass or glass to air optical control surface within the telescope, including windows or sensor covers or surfaces. For uncoated optics, the loss per surface is about 4% to 5%.

The ratio of the focal length to aperture is called the ________
A)
Focal number
B)
f/ number
C)
Critical aperture
D)
Effective aperture

Correct Answer : Option (B) :   f/ number

Explanation : The ratio of focal length to aperture is called the f/ number. For example, an f/10 telescope may have a 30 in. focal length and a 3 in. aperture.

The physical size of the star depends upon _____
A)
Shape of image
B)
Colour of image
C)
Angular size of image
D)
Intensity of image

Correct Answer : Option (C) :   Angular size of image

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