How long is 6500 seconds

This optional parameter is required for external and WAVE targets. It specifies whether to take the exposure at a single offset, at multiple offsets, or at no offset from the nominal central wavelength.

Obtaining exposures at small wavelength offsets from the specified central wavelength aids in the correction of the fixed-pattern defects of the detector. The exposure will be for the specified exposure duration. See the COS Instrument Handbook for specifics of the offsets and for guidance on how to use this capability. Indicates whether or not to "flash" the wavelength calibration lamp during exposures.

These flashes are needed to compensate for the effect of post-move drift of the Optic Select Mechanisms. The default behavior will be that the wavecal lamp is turned on briefly at the start of an externally targeted exposure, and at intervals later in the exposure.

The grating-dependent "flash" durations and the time-since-move-dependent flash intervals will be defined by the STScI. Specifying the value NO will disable automatic flashing for the current exposure.

When flashing is enabled, the exposure time must be at least as long as a single flash. On Earth, we used the solar day to regularise time and this represents the period taken to orbit the sun.

The sidereal day or stellar day is the time taken for the earth to rotate with respect to a distant star and equals 23 hours, 56 minutes and 4.

The earliest display and use of seconds was in the last half of the 16th century. Prior to this, it was not considered accurate enough to measure in seconds as a mechanical device was needed to ensure consistency. In , a Dutch scientist invented the first pendulum clock that measured seconds. His name was Christiaan Huygens. Learn more. Required to calculate the number of minutes as an int, then the seconds as a double.

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