It is well known that Adaptive Optics observations do require the availability of natural stars, on top of laser guide stars, to obtain the tip-tilt and focus information of the atmospheric turbulence. These bright enough natural stars are not always available and this is one the ultimate limits of the AO techniques, due to the small technical

Documented astronomical observations such as the heliacal rising and setting of stars and planets, eclipses or the first and last visibility of the lunar crescent can be used to establish absolute dates for ancient societies. Referring to preserved data from ancient Egypt, the Levante and Mesopotamia from the 2nd millennium BCE the potential of

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