Question

myUNM | The University of Ne X Mail - Emerald Albritton - Outic X Angles & the Celestial Sphere X C Part V-Parsecs The Word Pars X ? Course Hero learn.unm.edu/webapps/blackboard/execute/displayLearningUnit?course_id=_96142_1&content_id=_6677246_1 × + ?E: without worrying about how big the Moon or the airplane are in, say, km or m, or how far apart they are in space. Likewise, a point on the eastern horizon is separated from a point straight overhead by 90°. Question 1 Look at the image of the Moon and airplane above. Approximately how many of these airplanes fit across the diameter of the Moon? Using this answer, what is the angular size of the airplane in degrees? (Example: if 2 airplanes fit across the Moon's diameter, the airplane is approximately half the angular size of the Moon, or 0.25 degrees.) The fact that angles are used instead of linear measurements makes it better to think of the sky as an imaginary sphere on whose surface all the celestial object lie. Astronomers call this the Celestial Sphere (see the figure below). So remember to think in terms of angles when measuring distances on the Celestial Sphere. Parallax is an example of an angular measurement which you will be making in this lab. Vernal Equinox North Celestial Pole Celestial Equator North Pole South Pole Equator Right Ascension Declination South Celestial Pole (Courtesy Lunar and Planetary Institute) Ecliptic

          myUNM | The University of Ne X
Mail - Emerald Albritton - Outic X Angles & the Celestial Sphere X C Part V-Parsecs The Word Pars X ? Course Hero
learn.unm.edu/webapps/blackboard/execute/displayLearningUnit?course_id=_96142_1&content_id=_6677246_1
× +
?E:
without worrying about how big the Moon or the airplane are in, say, km or m, or how far apart they are in space. Likewise, a point on
the eastern horizon is separated from a point straight overhead by 90°.
Question 1
Look at the image of the Moon and airplane above. Approximately how many of these airplanes fit across the diameter of the
Moon? Using this answer, what is the angular size of the airplane in degrees? (Example: if 2 airplanes fit across the Moon's
diameter, the airplane is approximately half the angular size of the Moon, or 0.25 degrees.)
The fact that angles are used instead of linear measurements makes it better to think of the sky as an imaginary sphere on whose
surface all the celestial object lie. Astronomers call this the Celestial Sphere (see the figure below). So remember to think in terms of
angles when measuring distances on the Celestial Sphere. Parallax is an example of an angular measurement which you will be
making in this lab.
Vernal
Equinox
North
Celestial Pole
Celestial Equator
North
Pole
South
Pole
Equator
Right Ascension
Declination
South
Celestial Pole
(Courtesy Lunar and Planetary Institute)
Ecliptic

myUNM | The University of Ne X
Mail - Emerald Albritton - Outic X Angles the Celestial Sphere X C Part V-Parsecs The Word Pars X ? Course Hero
learn.unm.edu/webapps/blackboard/execute/displayLearningUnit?courseid=961421 contentid=66772461
× +
?E:
without worrying about how big the Moon or the airplane are in, say, km or m, or how far apart they are in space. Likewise, a point on
the eastern horizon is separated from a point straight overhead by 90°.
Question 1
Look at the image of the Moon and airplane above. Approximately how many of these airplanes fit across the diameter of the
Moon? Using this answer, what is the angular size of the airplane in degrees? (Example: if 2 airplanes fit across the Moon's
diameter, the airplane is approximately half the angular size of the Moon, or 0.25 degrees.)
The fact that angles are used instead of linear measurements makes it better to think of the sky as an imaginary sphere on whose
surface all the celestial object lie. Astronomers call this the Celestial Sphere (see the figure below). So remember to think in terms of
angles when measuring distances on the Celestial Sphere. Parallax is an example of an angular measurement which you will be
making in this lab.
Vernal
Equinox
North
Celestial Pole
Celestial Equator
North
Pole
South
Pole
Equator
Right Ascension
Declination
South
Celestial Pole
(Courtesy Lunar and Planetary Institute)
Ecliptic

Added by Taylor P.

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