The answer is surveying. Surveying over or arrive studying is the procedure, calling, and investigation of deciding the earthbound or three-dimensional position of focuses and the separations and points between them. A land reviewing proficient is known as a land surveyor.
a. Wild celebration
A revel is a wild celebration. Your context clue here is the detail that it went "whirlingly on". This gives the image that things are spinning and it is something that could end at midnight. An party hat doesn't end at midnight. A type of dance is something that can spin, but it usually doesn't continue on until midnight. A specific dance type usually only last for a few minutes. An appearance does not make sense.
A child said What is the grass? fetching it to me with full hands;
How could I answer the child? I do not know what it is any more than he.
I guess it must be the flag of my disposition, out of hopeful green stuff woven.
Or I guess it is the handkerchief of the Lord,
A scented gift and remembrancer designedly dropt,
Bearing the owner's name someway in the corners, that we may see and remark, and say Whose?