Based on the atmospheric transmission model, through the actual ray track, the zenith Angle is revised, which is a complicated function with launch Angle and altitude.

基于大气传输模型，采用光线传输的实际轨迹对天顶角进行修正处理，得出天顶角随发射角和传输高度的变化复杂函数。

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The new hotshoe-mounted O-GPS1 module fixes that oversight by recording latitude, longitude, altitude, Coordinated Universal Time and shooting angle.

ENGADGET: Pentax releases O-GPS1 add-on for DSLRs, appeals to astronomy nuts