Nav 4 Reviewer Questions

Question 1

A celestial coordinate system that uses the observer’s local horizon as the fundamental plane to define two angles

Answer 1

The horizon system of coordinates

Question 2

During winter solstice, Antarctic Circle experience how many hours of darkness?

Answer 2

0hrs

Question 3

Find the LHA of star if the Observer’s Longitude is 8O°E, GHA of Aries is 75°, SHA of star is 145°and GHA of star is 225°.

Answer 3

305°

Question 4

Great circle passing thru the center of the earth on the celestial sphere which means midway between ZENITH and NADIR

Answer 4

Rational Horizon

Question 5

How many are there inferior planets?

Answer 5

2

Question 6

Is a celestial body is the true compass direction from the observer to the observed celestial body

Answer 6

Azimuth

Question 7

Is a system of stars, planets, moons, and other objects, bound together by gravitational orbit?

Answer 7

Solar System

Question 8

It circle where the sky appears to meet the Earth when you’re observing from a particular location.

Answer 8

Celestial Horizon

Question 9

It is a great circle on the celestial sphere representing the sun’s apparent path during the year, so called because lunar and solar eclipses can occur only when the moon crosses it.

Answer 9

Ecliptic

Question 10

It is a great circle on the celestial sphere the pole of which is the Observer’s zenith or the great circle every point on which is 90 from the observer’s zenith.

Answer 10

Rational Horizon

Question 11

It is a point in the sky about which all the stars seen from the Southern Hemisphere.

Answer 11

South Celestial Pole

Question 12

It is a point in the sky about which all the stars seen from the Northern Hemisphere.

Answer 12

North Celestial Pole

Question 13

It is a point vertically above the observer or a line joining from the center of the Earth through the observer to the celestial sphere.

Answer 13

Zenith

Question 14

It is a point vertically below him or a point vertically opposite of Zenith on the celestial sphere.

Answer 14

Nadir

Question 15

It is a semi-great circle on the celestial sphere joining the celestial poles or projection of the earth’s meridians on the celestial sphere.

Answer 15

Celestial Meridian

Question 16

It is a small circle on the celestial sphere whose plane is parallel to the plane of rational horizon and passes through the eye of the observer

Answer 16

Sensible Horizon

Question 17

It is an angle at the celestial pole contained between the celestial meridian of the First point of Aries and that through the body, measured westward from Aries.

Answer 17

Sidereal Hour Angle

Question 18

It is an hour angle contained between the celestial meridian of the First point of Aries and the celestial meridian passing through the body, measured eastward from Aries.

Answer 18

Right Ascension

Question 19

It is an hour angle contained between the observer’s celestial meridian and the celestial meridian through that body, measured westward.

Answer 19

Local Hour Angle

Question 20

It is an hour angle of the body measured from observer’s meridian to the meridian of the body in easterly or westerly direction from 0° to 180°

Answer 20

Meridian Angle

Question 21

It is an imaginary sphere surrounding the Earth.

Answer 21

Celestial Sphere

Question 22

It is the angle at the celestial poles contained between the celestial meridian of Greenwich and celestial meridian passing through the body, measured westward from celestial meridian of Greenwich.

Answer 22

Greenwich Hour Angle

Question 23

It is the arc of vertical circle passing through the body contained between the rational horizon and the center of the body.

Answer 23

True Altitude

Question 24

It is the art of science of navigating by stars, sun, moon and planets, and is one of the oldest of human arts.

Answer 24

Celestial Navigation

Question 25

It is the line at which the sky and earth appear to meet.

Answer 25

Visible Horizon

Question 26

It is the point of the Earth’s orbit that is farthest away from the sun.

Answer 26

Aphelion

Question 27

It is the point of the Earth’s orbit that is nearest from the sun.

Answer 27

Perihelion

Question 28

It measures how much the shape of Earth’s orbit departs from a perfect circle?

Answer 28

Eccentricity

Question 29

Plane passing thru the observer eye which is parallel to the rational horizon.

Answer 29

Sensible Horizon

Question 30

The curvature of the earth which limit the field of vision of the observer.

Answer 30

Visible Horizon

Question 31

The Solar System has how many planets?

Answer 31

8

Question 32

The word “planet” comes from the Greek word “Planetes” which means.

Answer 32

Wanderer

Question 33

These are small circles on the celestial sphere parallel to the plane of equinoctial

Answer 33

Declination Circles/Parallels of Declination

Question 34

What does it means when you called Inferior Planet

Answer 34

Close to the sun than to Earth