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.

Jupiter’s moons

Io

Europa

S

WE

N

Ganymede

Callisto

ILLUSTRATIONS BY

ASTRONOMY

: ROEN KELLY

PSC

CET

SCL

FOR

CAE

ERI

CAS

AND

TRI

ARI

PER

AUR

TAU

ORI

COL

LEP

LY N

GEM

CNC

CMi

CMA

MON

ANT PYX PUP

HYA

SEX

LEO

LMi

Objects visible in the evening

Early evening

Sun

Venus

Ceres

Uranus

Path of the Sun (ecliptic)

Path of t

he Moo

n

25 24 23 22 21 20 19 18 17 16 15

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

Europa

Callisto

Io

Ganymede

Jupiter

Ceres

Saturn

Aphelion

is April 17

Mars

Earth

Neptune

Pluto

Venus

Jupiter

Jupiter

Mercury

Greatest western

elongation is April 29

Uranus

Solar conjunction

is April 18

WWW.ASTRONOMY.COM 41

Dots display positions

of Galilean satellites at

4 A.M. EDT on the date

shown. South is at the

top to match

the view

through a

telescope.

To locate the Moon in the sky, draw a line from the phase shown for the day straight up to the curved blue line.
Note: Moons vary in size due to the distance from Earth and are shown at 0h Universal Time.

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.