The Sun Through Time

Safe in the Sun

سرطانهای جلدی را می توان به انواع پیش بدخیم و بدخیم تقسیم نمود. شایعترین ضایعه جلدی پیش بدخیم، کراتوز آفتابی نام دارد که بصورت ضایعات خشک و دلمه دار جلدی بروز می کنند - لنتیگو  آفتابی یک ضایعه پیش بدخیم دیگرن است که بصورت لکه های قهوه ای و صاف (غیر برجسته روی پوست مشاهده می شوند) ضایعات پیش بدخیم در صورت عدم درمان می توانند بدخیم شوند. 

The Sun in Time: Activity and Environment

The Sun’s magnetic activity has steadily declined during its main-sequence life. While the solar photospheric luminosity was about 30% lower 4.6Gyr ago when the Sun arrived on the main sequence compared to present-day levels, its faster rotation generated enhanced magnetic activity; magnetic heating processes in the chromosphere, the transition region, and the corona induced ultraviolet, extrem...

The human circadian clock entrains to sun time

The human biological clock, which regulates processes from gene expression to behaviour, like that of most organisms, synchronises to the Earth’s 24 hour rotation using signals from the environment (zeitgebers). This synchronisation is an active process called entrainment [1]. Daily rhythms also persist in temporal isolation [2], deviating modestly from 24 hours (hence circadian). Light is the ...

Calculations on space-time curvature within the Earth and Sun

One aspect of the relativistic space-time curvature due to the presence of mass is the breakdown of Euclidean (fiat-space) geometry. For example, the diameter of a spherical mass is greater than the result obtained by dividing the circumference by π. The objective of this article is to determine the amount of discrepancy between ”relativistic” and” non-relativistic” diameters for objects such a...

Improving sun protection behaviour through evidence-based campaigns.