the islamic astronomy including the persian astronomy was thoroughly introduced into india from the 14th century ad or so. firstly, the astrolabe was introduced at the time of f?r?z sh?h tughluk?, and a sanskrit work entitled yantra-r?ja (1370 ad) was composed by mahendra s?ri. at that time, some sanskrit astronomical (or astrological) works were also translated into persian. the astrolabe beca...

once the greek astronomy's most worthy masterpiece, ptolemy’s almagest, was translated into arabic, many scientific works were produced in islamic civilization. the genre known as hayʾa, which deals with the cosmological aspect of astronomy, gradually seperated itself from other astronomical branches. while these branches were in relation with each other, their goals were different. comput...

muḥyī al-dīn maghribī is among the few astronomers of the middle ages whose astronomical system is entirely based on new measures of planetary parameters and whose measurement of the observational data and calculation processes for determining their amount have been carried out in maragha observatory. he has explained the details of his observations and calculations in a volume called talkhīṣ a...

simulation of gamma and hadron showers in the energy range 100gev- 25tev has been carried out. for a big ideal cherenkov light array, characteristics of lateral distribution of cherenkov photon density have been studied. results from this ideal detector are compared with those simulated for a real tunka- like array to investigate experimental potential of using existence of a hump in lateral di...