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Deeper understanding of the properties of dark energy via SNIa surveys, andto a large extent other methods as well, will require unprecedented photometricprecision. Laboratory and solar photometry and radiometry regularly achieveprecisions on the order of parts in ten thousand, but photometric calibrationfor non-solar astronomy presently remains stuck at the percent or greaterlevel. We discuss our project to erase this discrepancy, and our steps towardachieving laboratory-level photometric precision for surveys late this decade.In particular, we show near-field observations of the balloon-borne lightsource we are presently testing, in addition to previous work with a calibratedlaser source presently in low-Earth orbit. Our technique is additionallyapplicable to microwave astronomy. Observation of gravitational waves in thepolarized CMB will similarly require unprecedented polarimetric and radiometricprecision, and we briefly discuss our plans for a calibrated microwave sourceabove the atmosphere as well.

Precision Calibration via Artificial Light Sources Above the Atmophere