In this astronomical chart Gibbes provides a diagram, its calculations and results (phases of the eclipse: beginning, middle, end and duration), and the mathematical calculations for an annular partial eclipse of the sun in relation to the elements of the eclipse. Those elements are time, hourly motion, declination, hourly motion in declination and horizontal parallax.
Receipt to Frank W. Heyward signed by W. E. Haskell for $6472.56, probably related to Heyward's duty as executor of his father's estate. 1p. November 16, 1891.
