It seemed necessary, therefore, to take unusual precautions in order to secure accurate observations, and to give each one its full weight. Henrietta Swan Leavitt
It seemed necessary, therefore, to take unusual precautions in order to secure accurate observations, and to give each one its full weight.
We have records of planetary observations only from a time which is recent compared with such a vast enterprise: this makes [very long term] predictions insecure. Ptolemy
We have records of planetary observations only from a time which is recent compared with such a vast enterprise: this makes [very long term] predictions insecure.