Visible or Illuminated Fraction of Total Surface Area of a SphereThis program computes the visible fraction or illuminated fraction of the total surface area of a sphere at any distance from the eye or point light source as reckoned from the center or surface of the sphere.The radius and distance can be in any convenient linear units. The default values are the mean lunar radius and the mean geocentric lunar distance in statute miles. For a sphere of radius
1079.35 units, where the distance to the eyeor pointlight source is 238856 units from the center:Visible or illuminated fraction of surface = 49.774058 percentInvisible or shaded fraction = 50.225942 percentDifference = 0.451884 percent
© 2017  Jay Tanner
