In the path of Mars against the background stars shown in Figure 2-2, the planet appears from Earth to move in a loop, moving westward for a period of time. In the 2012 loop, what is the angle between the Earth-Sun line and Earth-Mars line when the planet is halfway through the retrograde motion, in late February? 
Definitions:
Shortage
A market condition where the demand for a product exceeds the supply at a given price, often leading to higher prices.
Surplus
A situation where the quantity of a good or service supplied exceeds the quantity demanded at the current price.
Equilibrium Quantity
The quantity of goods or services that is supplied and demanded at the equilibrium price, where the quantity supplied equals the quantity demanded.
Equilibrium Price
The market price at which the supply of an item matches its demand, leading to a stable market where there is no surplus or shortage.
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