7) As HB is at its closest to the earth on March 22, 1997, it's almost precisely over the north pole of the sun.
(HB; is; at its closest to the earth on March 22, 1997) (it; 's; almost precisely over the north pole of the sun)
HB it
is 's
at its closest to the earth on March 22, 1997
almost precisely over the north pole of the sun