the official iranian calendar is a solar one that in both the length and the first day of its year is based not on convention, but on two natural (i.e. astronomical) factors: a) the moment of coincidence of the centre of the sun and the vernal equinox during the sun’s apparent revolution around the earth; and b) the time length between two successive apparent passages of the sun’s center across...

the purpose of the present study is to investigate the effects of moon phases on suicides, car accidents, and psychic crises. the data were obtained from archives of imam khomeini hospital, traffic office, and razi psychiatric hospital in tabriz. the sample consisted of 808 suicide cases and 6301 cases of city car accidents in 1989, and 3632 cases admitted to psychiatric hospital during the yea...

spatial distribution of thermal regions is dependent on local factors and circulation patterns in long terms. recognition of spatial distribution of temperature in geographical regions could be help on planning and environmental policies. the aim of this paper is recognition and detachment of thermal regions in iran. for this object, maximum daily temperature data have been provided using 620 s...

In the 13th century, a new type of Chinese astronomical calculation was put into use, and it was almost entirely included in the calendar of Shoushi (formulated by Guo shou-jing and his collaborators, epoch AD 1281, adopted from AD 1281−1644). Afterwards, this calendar has been thought of as one of the most accurate in the history of China. The perfectly systematic theoretical models at that ti...