this paper studies two ancient seasonal festivals which were celebrated on summer and winter solstices. because of misconceptions regarding sasanian calendar, these two festivals, known as ābrīzgān and āḍarjašn, have remained unnoticed in modern researches. a sound interpretation of the old iranian calendar as described by biruni would uncover the true character of these festivals. this paper d...

We present a system to support human recollection with tag clouds, which are created from keywords generated by our algorithms from the use information of Google Calendar and Twitter. The main feature of our research is to weight words using the number of photos taken by users to recall impressive events. We evaluated tag clouds by comparing our approach and a comparative approach, and our expe...

Context. Despite the wealth of solar data currently available, the explicit connection between coronal streamers and features on the solar disk remains unresolved. Aims. An empirical three-dimensional model, which reproduces the evolution of the large-scale coronal structure starting from the solar surface, is presented. The model is based on the view that the source of the large-scale coronal ...

The objective of this research is to develop a mathematical procedure construct Hijri calendar that consistent with the Gregorian calendar. Our hypothesis was derived from Quran Chapter, Alkahf verse (25), which states “They remained in their cave for three hundred years, adding nine”. We understand mean “every 300 solar years equivalent exactly 309 lunar years”. starting point locate number da...

Calendrical calculations are ubiquitous. Banks need to calculate interest on a daily basis. Operating systems need to switch to and from daylight savings time. Dates of secular and religious holidays need to be computed for consideration in planning events. Paychecks need to be issued on weekly, biweekly, or monthly schedules. Bills and statements must be generated periodically. Most of these c...

Background & aim: Premenstrual syndrome (PMS) refers to a set of psychological and physical symptoms, which interfere with one’s daily life. The aim of this study was to determine whether the perceived severity of PMS symptoms is correlated with knowledge, attitude, and severity of this condition according to the daily registration calendar among students of Ferdowsi University of Mashhad, Iran...

A study has been carried out on the occurrence of bottom side equatorial spread F (ESF) and its dependence on the polarity and magnitude of the thermospheric meridional wind just prior to ESF occurrence during summer, winter and equinox seasons of solar maximum (2002) and minimum years (1995), using ionosonde data of Trivandrum (8.5 N, 76.5 E, dip=0.5 N) and SHAR (13.7 N, 80.2 E, dip ∼5.5 N) in...

â â â  in this research, temporal and spatial behaviors of azores high pressure was studied at the level of 700 hpa. this study has been done using daily data of geopotential height at 12 gmt in ncep/ncar database with spatial resolution of 2.5*2.5 degree in a 55 years period including 20089 days from january, 1st, 1951(dey, 11th, 1329) to december, 31st,2005(dey, 10th,1384). at first, the mean...