The components of the armillary sphere are labeled.

A

equinoctial ring, showing the sun's ascension

b

north pole nut holding sun Ψ

B

ecliptic ring, showing location of the sun on a specific day of a month

C

tropic of Cancer

d

pin holding moon Ζ

D

tropic of Capricorn

e

where tropic of Cancer touches ecliptic

E

arctic circle

f

where tropic of Capricorn touches ecliptic

F

antarctic circle

G

equinoctial colure

H

solstitial colure

J

terrestrial globe

K

terrestrial axis

L

flat celestial meridian

M

movable horizon

n

terrestrial north pole

N

celestial north pole

N

pedestal

O

joint

P

arc of joint O (0 to 90 degrees)

Q

brass arm

r

elevation screw

R

upright piece

s

terrestrial south pole

S

celestial south pole

T

box

U

1st of 2 axes of wheels for T (earth turns)

V

2nd of 2 axes of wheels for T (sphere of circles turns)

W

winch

Ψ

sun

Ζ

moon

خلاصه

اجازه‌نامه

	این اثر در کشورهایی و مناطقی که مدت زمان حق تکثیر، عمر پدیدآورنده بعلاوه 100 سال یا کمتر بعد از مرگ او است، در مالکیت عمومی قرار دارد. You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
	این پرونده تحت قانون حق تکثیر محدودیت آزاد منتشر شده که شامل تمامی حقوق مربوطه و حقوق نزدیک به آن می‌شود.

https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse

This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.