... Description: SUBROUTINE PGSHS (ANGLE, SEPN, PHASE) REAL ANGLE, SEPN, PHASE Set the style to be used for hatching (fill area with fill-style 3). ... Arguments: ANGLE (input) : the angle the hatch lines make with the horizontal, in degrees, increasing counterclockwise (this is an angle on the view surface, not in world-coordinate space). ... To hatch a region with alternating lines of two colors, fill the area twice, with PHASE=0.0 for one color and PHASE=0.5 for the other color. ...

metrologia The leap second: its history and possible future R. A. Nelson, D. D. McCarthy , S. Malys, J. Levine, B. Guinot, H. F. Fliegel , R. L. Beard and T. R. Bartholome w Abstract. This paper reviews the theoretica l motivatio n for the leap second in the context of the historica l evolutio n of time measurement . Th e periodic insertio n of a leap second step into th e scale of Coordinate d Universal Time (UTC) necessitates frequent changes in comple x timekeepin g systems an d is currentl y th e