???? ???? ??? ??? ??? ???? ????? ??? ?????.?????????????????????????????????????????????????????????????????? ??? ????? ??? ???? ?? ??? ?? ????. ??? ??, ?? ?? ?? ??, ?? ??? ?? ?? ????? ??? ? ??? ???, ?? ????? ?? ? ??? ??? ? ????.? ?? ??? ??? ?? ?? ?? ?? ? ?? ?? ? ??? ?? ??Younger's do the job was refined inside the 1820s by George Biddell Airy, who