zenith

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ZHR: zenithal hourly rate; expected maximum rate under observing conditions when stars of 6.
Its sensor package includes a Super HAD CCD camera capable to operate down to 0,01Lux, though an optional zenithal thermal imager can be fitted either to replace the daylight camera or to complement it.
The first definition of e-service quality appears to be that of Zenithal, Parasuraman, and Malhotra (2000, p.
Automatic determination of vertical deflection components from GPS and zenithal star observations, Acta Geodyn.