Altitude
Altitude has an effect on a location's position relative to the plane formed by a circle of latitude. Since altitude is determined by the normal to the Earth's surface, locations sharing the same latitude—but having different elevations (e.g., lying along this normal)—no longer lie within this plane. Rather, all points sharing the same latitude and of varying elevation occupy a cone formed by the rotation of this normal around the Earth's axis.
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Circles of latitude / Meridians
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Equator
Tropic of Cancer
Tropic of Capricorn
Arctic Circle
Antarctic Circle
Equator
Tropic of Cancer
Tropic of Capricorn
Arctic Circle
Antarctic Circle
Equator
Tropic of Cancer
Tropic of Capricorn
Arctic Circle
Antarctic Circle
W 0° E
30°
60°
90°
120°
150°
180°
30°
60°
90°
120°
150°
180°
5°
15°
25°
35°
45°
55°
65°
75°
85°
95°
105°
115°
125°
135°
145°
155°
165°
175°
5°
15°
25°
35°
45°
55°
65°
75°
85°
95°
105°
115°
125°
135°
145°
155°
165°
175°
10°
20°
40°
50°
70°
80°
100°
110°
130°
140°
160°
170°
10°
20°
40°
50°
70°
80°
100°
110°
130°
140°
160°
170°
0°
10°
20°
30°
40°
50°
60°
70°
80°
90°
10°
20°
30°
40°
50°
60°
70°
80°
90°
5° N
15°
25°
35°
45°
55°
65°
75°
85°
5° S
15°
25°
35°
45°
55°
65°
75°
85°
45x90
45x90
45x90
45x90
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Greek astronomy
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| Astronomers |
- Acoreus
- Aglaonike
- Agrippa
- Anaximander
- Andronicus
- Apollonius
- Aratus
- Aristarchus
- Aristillus
- Attalus
- Autolycus
- Bion
- Callippus
- Cleomedes
- Cleostratus
- Conon
- Eratosthenes
- Euctemon
- Eudoxus
- Geminus
- Heraclides
- Hicetas
- Hipparchus
- Hippocrates of Chios
- Hypsicles
- Menelaus
- Meton
- Oenopides
- Philip of Opus
- Philolaus
- Posidonius
- Ptolemy
- Pytheas
- Seleucus
- Sosigenes of Alexandria
- Sosigenes the Peripatetic
- Strabo
- Thales
- Theodosius
- Theon of Alexandria
- Theon of Smyrna
- Timocharis
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| Works |
- Almagest (Ptolemy)
- On Sizes and Distances (Hipparchus)
- On the Sizes and Distances (Aristarchus)
- On the Heavens (Aristotle)
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| Instruments |
- Antikythera mechanism
- Armillary sphere
- Astrolabe
- Dioptra
- Equatorial ring
- Gnomon
- Mural instrument
- Triquetrum
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| Concepts |
- Callippic cycle
- Celestial spheres
- Circle of latitude
- Counter-Earth
- Deferent and epicycle
- Equant
- Geocentrism
- Heliocentrism
- Hipparchic cycle
- Metonic cycle
- Octaeteris
- Solstice
- Spherical Earth
- Sublunary sphere
- Zodiac
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| Influences |
- Babylonian astronomy
- Egyptian astronomy
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| Influenced |
- European astronomy
- Indian astronomy
- Islamic astronomy
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