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为了发展反季蔬菜生产，目前我国北方都在兴建日光温室，生产秋冬季和冬春季蔬菜。建造日光温室首先要定好温室的方向，温室的方位对温室的采光和保温性能影响很大，一般都用罗盘仪式指南针来确定方向。用指南针确定的方向必须知道当地的磁偏角度数，否则就得不到精确的方向。?
In order to develop anti-season vegetable production, at present, northern China are building solar greenhouse, producing autumn and winter and winter and spring vegetables. First of all, the construction of solar greenhouse to be the direction of the greenhouse, greenhouse orientation on the greenhouse lighting and insulation performance of a great influence, usually with a compass ceremony compass to determine the direction. The direction determined by the compass must know the local magnetic declination, or you will not get the exact direction. ?