relative magnitude

the larger the circle the brighter it appears to us on Earth
Ž    Ž

double or multiple stars

variable star

open cluster

globular cluster

galaxy

diffuse nebula

planetary nebula

letter and then numbers with M, N, or I

galaxy, star clusters, or nebulae names

east/west lines

represent the declination from the real equator

north/south lines

represent time during the year

dotted lines with names

boundaries of the constellations, total of 88

dotted lines without names

represent either galactic equator or ecliptic

Greek alphabet

helps identify a star, used like a first name and in most cases refers to brightness (alpha being the brightest)

numbers

refer to stars