| They used two sticks in the form of a cross, viewing astronomical objects through the right angle formed by the sticks. |
| Because of the astronomical position of Mercury, it is always close to the Sun. |
| Reform was required because too many leap days are added with respect to the astronomical seasons on the Julian scheme. |
| Finally, the translation of Ptolemy's Almagest furnished important astronomical material. |
| These services include excellent products, reasonable prices, and astronomical shipping fees. |
| It was another Johannes, also a German, who in 1472 became the first person to print an astronomical almanac. |
