... Lyman-alpha line, while HST is within Earth shadow and Venus is at 47.1 degrees ... taken in time tag mode, while HST is in Earth shadow but Venus is above the horizon ...
... The ?shadow? and ?average? values of the Earthshine contribution in the ETC ... low, average, high) and Earthshine (shadow, average, high, extremely high) sky ... Geocoronal Emission and Shadow . ...
... The ?shadow? and ?average? values of the Earthshine contribution in the Exposure ... low, average, high) and Earthshine (shadow, average, high, extremely high) sky ... Geocoronal Emission and Shadow . ...
... It is possible to request that exposures be taken when HST is in the umbral shadow of the earth to minimize geocoronal emission (e.g., if you are observing weak lines at ~1216 or ~1304 е) using the special requirement SHADOW . ...
... The Church says the Earth is flat, but I know that it is round, for I have seen the shadow on the moon, and I have more faith in a shadow than in the Church." ...
... Another option for reducing the sky brightness, is the special requirement SHADOW, which forces the observation to be made when HST is in the Earth's shadow. ...
... Another option for reducing the sky brightness, is the special requirement SHADOW, which forces the observation to be made when HST is in the Earth's shadow. ...