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	Term	术语	Definition	定义
	gravity wave	重力波	See WAVE.	其传播速度主要由重力控制的波。波长大于2英寸的水波即可看做重力波。
	grease ice	油脂状冰，泥泞状冰	A later stage of freezing than frazil ice when the crystals have coagulated to form a soupy layer on the surface. Grease ice reflects little... more A later stage of freezing than frazil ice when the crystals have coagulated to form a soupy layer on the surface. Grease ice reflects little light, giving the sea a matt appearance.	当冰晶已经凝固，在表面形成糊状层时的冰冻阶段。油脂状冰反光性不强，使海面较暗淡。
	great circle	大圆、大圈	See CIRCLE.	过球心的平面和球体的交线。亦可参见orthodrome（大圆航线）。
	great circle: primary	NULL	See PRIMARY GREAT CIRCLE.	NULL
	great circle bearing	大圆方位	See BEARING.	通过地球上两点的大圆的起始方向，表示为自基准方向起算的角距离。由各种形式的辐射能所获得的方位均为大圆方位。
	great circle chart	大圆海图	See CHART: GNOMONIC.	参见gnomonic chart（日晷投影图）。
	great circle course	大圆航向，大圆航线	See COURSE.	通过航行始发点和终点的大圆的方向，用自基准方向（通常为北）到大圆方向的角距表示。沿大圆航线上的每一点的角度均不同。在始发点的角度称为大圆航行始航向；终点的角度称为大圆航线终航向。
	great circle sailing	大圆航行，大圆航法	See SAILING.	沿大圆航线航行的方法。
	great circle track	大圆航迹	See TRACK.	参见track（航迹）。
	great diurnal range	最大平均日潮差	See RANGE: DIURNAL.	参见diurnal range（日潮差）。
	greatest elongation	大距	See ELONGATION.	参见elongation（距角，大距）。
	great tropic range	回归大潮潮差	See RANGE.	回归高高潮和回归低低潮之间的潮高差。
	Greenwich civil time	格林尼治民用时	See TIME: GREENWICH MEAN.	见greenwich mean time（格林尼治平时）。
	Greenwich hour angle	格林尼治时角	See HOUR ANGLE.	参见hour angle（时角）。
	Greenwich mean time (GMT)	格林尼治平时	See TIME.	在格林尼治子午线上的平太阳时。见“Universal Time（UT，世界时）”。
	Greenwich meridian	格林尼治子午线	See MERIDIAN.	穿过格林尼治天文台中星仪中心的天文子午线，作为格林尼治时间的基准。与地方子午线对应。
	Greenwich time	格林尼治时间	See TIME.	基于格林尼治子午线的时间。
	grid	经纬网，直角坐标；格网；栅格；栅极	A series of lines, usually straight and parallel, superimposed on a CHART or PLOTTING SHEET to serve as a directional reference for NAVIGAT... more A series of lines, usually straight and parallel, superimposed on a CHART or PLOTTING SHEET to serve as a directional reference for NAVIGATION. See also GRATICULE. Two sets of mutually perpendicular lines dividing a MAP, CHART, or other representation of the EARTH's surface, into squares or rectangles to permit location of any point by a system of RECTANGULAR COORDINATES. In electronics, an electrode with one or more openings to permit passage of electrons or ions.	叠加在海图或者空白海图上的一系列平行直线，作为导航中的参考方向。亦可见graticule（经纬网）。两组平行线将地图、海图或者其它平面图划分为正方形或者矩形格网，用于确定任意点的地理位置。在电子学中，指具有一个或者多个开路，能使电子或者离子通过的电极。
	grid: parallactic	视差格网	In PHOTOGRAMMETRY, a uniform pattern of rectangular lines drawn or engraved on some transparent material, usually glass, and placed either ... more In PHOTOGRAMMETRY, a uniform pattern of rectangular lines drawn or engraved on some transparent material, usually glass, and placed either over the PHOTOGRAPHS of a STEREOSCOPIC PAIR or in the OPTICAL SYSTEM of a STEREOSCOPE, in order to provide a continuous floating-mark system.	在摄影测量学中，指绘在或刻在透明物（通常为玻璃）上的大小一致的矩形方格，将其置于立体像对像片上或立体镜光学系统中，以提供连续的浮标标志系统。
	grid: perspective	透视投影格网	In PHOTOGRAMMETRY, a network of lines, drawn or superimposed on a PHOTOGRAPH, to represent the perspective of a systematic network of lines... more In PHOTOGRAMMETRY, a network of lines, drawn or superimposed on a PHOTOGRAPH, to represent the perspective of a systematic network of lines on the GROUND or DATUM PLANE. See also GRID METHOD.	在摄影测量学中，指绘制或加印在像片上的网线，用于表示地面或基准面上系统网线的透视图形。亦见grid method（格网转绘法）。
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