Astronomy

This map unfolds the entire night sky from sunset (at right) until sunrise (at left).

Arrows and colored dots show motions and locations of solar system objects during the month.

The planets

in their orbits

Arrows show the inner planets’

monthly motions and dots depict

the outer planets’ positions at mid-

month from high above their orbits.

Jupiter’s moons

Io

Europa

S

WE

N

Ganymede

Callisto

ILLUSTRATIONS BY

ASTRONOMY

: ROEN KELLY

COM

BOÖ

SER

VIR

LIB

LUP

SCO

ARA

TEL

SGR

SCT

AQL SER OPH

HER

DRA

LY R

CYG

VUL

SGE
DEL

CAP

ANT

CEN

CRV CRT HYA

SEX

LEO

CVn UMa

CrA

LMi

CrB

Objects visible in the evening

Sun

Early evening

Pluto Saturn

Jupiter

3 2 1

30 29 28 27 26 25 24 23 22 21 20 19

1 2 3 4 5 6 7 8 9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

3

Callisto

Europa

Io

Ganymede

Jupiter

Mercury

Greatest western elongation

is September 12

Earth

Autumnal equinox

is September 22

Ceres

Neptune

Opposition is

September 4/5

Mars

Uranus

Saturn

Pluto

Venus

Jupiter

Jupiter

WWW.ASTRONOMY.COM 41

Dots display positions

of Galilean satellites at

11 P.M. EDT on the date

shown. South is at the

top to match

the view

through a

telescope.

The planets

in their orbits

Arrows show the inner planets’

monthly motions and dots depict

the outer planets’ positions at mid-

month from high above their orbits.