Slide 1

Question 1

The celestial equator is a great circle which is the:
a. intersection of the terrestrial equatorial plane with
the celestial sphere
b. apparent path of the earth on the celestial sphere
c. ecliptic
d. hour circle of the sun

Answer 1

intersection of the terrestrial equatorial plane with

Question 2

An observertical axis in the celestial sphere is a line
a. Normal to the horizon of the observer
b. Normal to the polar axis of the celestial sphere
c. Normnal to the plumb line of the observer
d. Normal tot the plane of the celestial equator

Answer 2

Normal to the horizon of the observer

Question 3

What is the great circle that divides the earth with the
northern and southern hemisphere
a. A meridian at longitudinal zero
b. A parallel of latitude at Greenwich
c. The prime meridian
d. The parallel at zero latitude

Answer 3

The parallel at zero latitude

Question 4

What is the great circle that divides the earth in the eastern
and western hemisphere
a. The meridian at zero longitude
b. The vertical at Greenwich
c. The parallel of latitude at the equator
d. The meridian at 120° longitude

Answer 4

The meridian at zero longitude

Question 5

What would be the position of the observer when his horizon
is normal to the axis of the carth?
a. At latitude 60°N
b. At latitude 45° N
c. Zero latitude
d. At latitude 90°N

Answer 5

At latitude 90°N

Question 6

What would be the position of the observer in the northern
hemisphere when his horizon is parallel to the polar axis of
the earth?
a. At zero latitude
b. At latitude 30° N
C. At latitude 25° N
d. At latitude 90° N

Answer 6

At zero latitude

Question 7

The intersection of the plane of the earth’s axis and the
celestial sphere is the great circle called the:
a. Equinoctial colure
b. Celestial equator
c. Ecliptic
d. The hour circle of zero declination

Answer 7

Ecliptic

Question 8

The maximum declination of a point on the ecliptic is:
a. 23°30° N
b. 15° N
C. 60° N
d. 18°30’ N

Answer 8

a. 23°30° N

Question 9

The minimum declination of a point on the ecliptic is:
a. 15°S
b. 60°S
c. 18°30’S
d. 23°30’S

Answer 9

23°30’S

Question 10

The point of zero declination on the ecliptic is at the:
a. Vernal equinox
b. Lower culmination of the sun
c. Upper Culmination of the sun
d. Elongation of the Polaris

Answer 10

Vernal equinox

Question 11

The point of zero declination on the ecliptic is at the:
a. Vernal equinox
b. Lower culmination of the sun
c. Upper Culmination of the sun
d. Elongation of the Polaris

Answer 11

Vernal equinox

Question 12

The points of maximum dechination on the celestial sphere is
at the:
a. Elongation of the Polaris
b. Vernal equinox
c. Poles
d. Culmination of the sun

Answer 12

Poles

Question 13

The points of zero declination on celestial sphere is:
a. Anywhere on the celestial equator
b. Anywhere on the equinoctial colure
C. Anywhere on the hour circle of the Polaris
d. Anywhere on the ecliptic

Answer 13

Anywhere on the celestial equator

Question 14

The equinoctial colure is an hour circle passing to the:
a. Greenwich
b. Vernal Equinox
c. Polaris
d. Parallel of zero declination

Answer 14

Vernal Equinox

Question 15

The right ascension ofa star is the angle measured along the:
a. Celestial equator eastward from the equinoctial colure to the
hour circle of the star
b. Celestial equator westward from the Star’s meridían to the
equinoctial colure
c. Ecliptic westward from the Star’s meridian to the equínoctial
colure
d. Ecliptic eastward from the Star’s meridian to the equinoctial
colure

Answer 15

Celestial equator eastward from the equinoctial colure to the
hour circle of the star

Question 16

The meridian of a celestial body is a great circle that is
identical to a:
a. Meridian of zero declination passing thru Greenwich
b. Parallel of a declination of the celestial
c. Right ascension of the celestial body
d. Hour circle of the celestial body

Answer 16

Hour circle of the celestial body

Question 17

The meridian of a celestial body is a great circle that is
identical to a:
a. The pole to the body along its hour circle
b. The equator to the body along its hour circle
c. The pole to the body along its vertical circle
d. The horizon to the body along its vertical circle

Answer 17

The pole to the body along its hour circle

Question 18

The declination of a heavenly body is the spherical angle
measured from the:
a. Pole to the body along its vertical circle
b. Pole to the body along its hour circle
C. Equator to the body along its hour circle
d. Horizon to the body along its vertical circle

Answer 18

Equator to the body along its hour circle

Question 19

The zenith distance of a heavenly body is the spherical angle
measured from the:
a. Zenith to the body along its vertical circle
b. Pole to the body along its hour circle
c. Equator to the body along its hour circle
d. Horizon to the body along its vertical circle

Answer 19

a. Zenith to the body along its vertical circle

Question 20

The altitude of a star is the spherical angle measured from
the:
a. Pole to the body along its hour circle
b. Horizon to the body along its vertical circle
c. Equator to the body along its hour circle
d. Zenith to the body along its vertical circle

Answer 20

b. Horizon to the body along its vertical circle

Question 21

The horizon system is an astronomic system using as
coordinates
a. Altitude and azimuth
b. Declination and horizontal angle
c. Declination and azimuth
d. Altitude and horizontal angle

Answer 21

a. Altitude and azimuth

Question 22

The local hour angle of a star with respect to the place of
observation is the angle measured from the:
a. Meridian of the place westward to the hour circle of the star
along the equator
b. Meridian of the place eastward to the meridian of a star
along the equator
c. Meridian of the place eastward to the meridian of a star
along the horizon
d. Meriđian of the place westward to the meridian of the star
along the horizon

Answer 22

a. Meridian of the place westward to the hour circle of the star
along the equator

Question 23

In the observation of the star for the determination of the
direction of a line, the position coordinates needed at a point
of observation is:
a. Polar distance
b. Longitude
c. Hour angle
d. latitude

Answer 23

d. latitude

Question 24

In the observation of the star for the determination of the
direction of a line, the time of observation is recorded for
Computation of the variation of the
a. Horizontal angle of the star
b. Altitude of the star
c. Hour angle of the star
d. declination of the star

Answer 24

declination of the star

Question 25

A star is at its instant of elongation when its:
a) Hour and vertical circles are normal
b) Hour circle is normal to the observers meridian
c) Vertical circle is normal to the observers meridian
d) Hour circle is normal to the equinoctial colure

Answer 25

a) Hour and vertical circles are normal

Question 26

A star is at transit at a place when:
a. The vertical circle of a star coincides with the meridian of
the place
b. The meridian of a star coincides with the prime meridian
c. The meridian of a star coincides with the equinoctial
colure
d. The meridian of a star coincides with the vernal equinox

Answer 26

a. The vertical circle of a star coincides with the meridian of
the place

Question 27

If e andf are the eccentricity and the flattening of the
spheroid then:
a. e^2 = 2f + f^2
b. e^2 = 2f +f^2
c. e=2f - f^2
d. e = 2f - f^2

Answer 27

e = 2f - f^2

Question 28

The sidereal hour angle of a star is the:
a. Vernal equinox westward to the hour circle of the star
along the equator
b. Vernal equinox eastward to the meridian of the star along
the equator
C. Automnal equinox eastward to the meridian of the star
along the equator
d. Automnal equinox westward to the meridian of the star
along the equator

Answer 28

a. Vernal equinox westward to the hour circle of the star
along the equator

Question 29

The Greenwich hour angle of a star is the angle measured
from the:
a. Prime meridian westward to the hour circle of a star along
the equator
b. Equinoctial colure castward to the meridian of a star along
the equator
c. Observers meridian westward to the meridian to the star
along the equator
d. Prime meridian eastward to the meridian to the star along
the equator

Answer 29

a. Prime meridian westward to the hour circle of a star along
the equator

Question 30

The equator-right ascension system is an astronomic
coordinate system using as coordinates
a. Declination and azimuth
b. Declination and horizontal angle
c. Declination and right ascension
d. Declination and hour angle

Answer 30

c. Declination and right ascension

Question 31

The equator-hour angle system is an astronomic coordínate
system using a coordinates:
a. Declination and hour angle
b. Declination and horizontal angle
c. Declination and azimuth
d. Declination and right ascension

Answer 31

a. Declination and hour angle

Question 32

The three great circles involved in the formation in the
astronomic triangle of the celestial sphere are:
a. Observers meridian, hour and vertical circles of the star
b. Observers meridian, the equinoctial colure and ecliptic
c. Hour and vertical circles of the star and the ecliptic
d. Hour and vertical circles of the star and the equinoctial
colure

Answer 32

a. Observers meridian, hour and vertical circles of the star