要知道软件升级到可以预测撞击的确切经纬度绝非易事，因为切斯利每次都要将地球自传，方向及旋转轴等因素考虑在内。

Upgrading it to give the exact latitude and longitude of the collision wasn’t simple work, since Chesley had to factor in the spin, orientation and rotational wobble of the Earth at each moment.

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销售的测绘仪器从常规的光学经纬仪、水准仪到电子全站仪、GPS及其软件等。

Sales of surveying and mapping equipment from conventional optical theodolite, Level electronic Total Station, GPS and software.

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