Structure of the Solar system

Structure of the Solar system

The solar system - set of space bodies, interaction between which is explained by laws of gravitation. The sun is the central object of the Solar system. Being from the Sun at different distance, planets rotate almost in one plane, in one direction on elliptic orbits. There was a birth of the Solar system as result of powerful compression of a cloud of gas and dust 4.57 billion years ago.

How to calculate wavelength

How to calculate wavelength

Wavelength, speed of its distribution and frequency of fluctuations are the sizes connected among themselves. Most quickly electromagnetic waves in a vacuum move, the speed of their distribution in other environments is much less. Sound waves on several orders more slowly.

When there is a summer and winter solstice

When there is a summer and winter solstice

The astronomy is one of the most ancient sciences – all civilizations proportioned human life to the movement of stars in the sky. The day length and years are in direct dependence on frequency with which Earth rotates round its pivot-center and around the Sun. Characteristic points of annual rotation of Earth are days of the vernal and autumn equinox, a summer and winter solstice. Dates of holidays and the calendar of agricultural works were dated for them.

How to measure time

How to measure time

Since ancient times the people are familiar with such regularities that day replaces night, spring – summer, the full moon turns into a narrow sickle. Watching these changes, people learned to predict them, using the simplest devices and calculations. Sand and the sundial measured time of day, watching the moon – defined month, monitoring change of seasons – year.

Than plants breathe

All living beings of the huge planet are subordinated to one general law of life: to the law of a kislorodoobmen by means of commission of a certain irresponsible act under the name breath. Not a so special exception of this rule are also ordinary plants. Process of breath supports in them all biologically active systems, causes activity of cages and bodies.