You dont need giant rocks to observe the sun and moon though.
You do if you want a durable record of your observations e.g., for the purposes of showing future generations you could align with spring solstice, or predict phases of moon, or eclipses. That's impressive and maybe even useful.
What if you want the sun and moon to notice you?
You do if you want a durable record of your observations e.g., for the purposes of showing future generations you could align with spring solstice, or predict phases of moon, or eclipses. That's impressive and maybe even useful.