During an equinox, the sun is directly earths

a. axis
b. equator
c. northern hemisphere
d. southern hemisphere

"The winter solstice marks the shortest day and longest night of the year. In the Northern Hemisphere, it occurs when the sun is directly over the Tropic of Capricorn, which is located at 23.5° south of the equator and runs through Australia, Chile, southern Brazil, and northern South Africa."

Your winter solstice marks the shortest day and longest night of the year. In the Northern Hemisphere, it occurs when the sun is directly over the Tropic of Capricorn, which is located at 23.5° south of the equator and runs through Australia, Chile, southern Brazil, and northern South Africa

The sun's parallax would be 180 degrees, greater than which you can't get.  so a. would be your anwser 

Ibelieve it is the 2nd answer, create gardens on all rooftops. let me know if this .