Caption: An all-sky sky map displaying the equatorial coordinate system, ecliptic, the constellations and the Milky Way.

Features:

1. The left-hand side is the summer night sky and the right-hand side is the winter night sky.

2. The summer night sky is the winter day sky and the winter night sky is the summer day sky.

   Of course, you don't see the stars in daytime usually. They are lost in the diffuse sky radiation (the blue sky) caused sunlight scattering in the Earth's atmosphere.

3. The left direction is eastward on the sky map as is conventional in sky maps.

   The convention is probably because in the Northern Hemisphere we usually think of ourselves as facing south when tilting our heads up to view the sky. Viewing the sky this way puts the east on the left-hand side.

4. As an observational astronomical object to the naked eye, the Milky Way is a faint white band on the sky---or road---the Milky Way.

   We see it like this because the Solar System is embedded Galactic disk about 8 kpc from the Galactic center.

5. The Galactic center is in the constellation Sagittarius.

   In the Northern Hemisphere, Sagittarius is low in the southern sky in the summer night sky.

6. Actually, we do NOT see very far in the Galactic disk (a few kiloparsecs) in the visible because of the obscuration of interstellar dust.