شرح ساينس الصف الخامس الابتدائي لغات مستر احمد الباشا
ساينس خامسة ابتدائي

لينك تحميل الملزمة
https://drive.google.com/file/d/1IiaVhvi4oAkzDPvZBw-b1IktJsLUmTmf/view?usp=sharing

لينك تليجرام
https://t.me/mrahmedelbashagroup

In this part :
Cycle of day and night
► Cycle means a series of events that is repeated in the same order for example:
- The cycle of day and night.
- The cycle of seasons.
► Earth rotates counterclockwise on its vertical axis that passes through the two poles of Earth causing the cycle of day and night.


Solar system
• Solar system includes the Sun and eight planets that revolve around the Sun in fixed orbits.
• Jupiter is the fastest planet that rotates on its axis in the solar system (Jupiter is one of the eight planets of solar system).

Sunrise and Sunset
• Earth revolves around the Sun in an elliptical orbit (oval path).
• Earth is slightly tilted on its axis.
•As Earth revolves around the Sun, the angle of tilt changes throughout the year.
• The Sun appears to travel across the sky at slightly different speeds each day due to:
- The elliptical orbit of Earth.
- The tilt of Earth on its axis.
So, the two reasons above cause different sunrise and sunset times each day on Earth.

Now, let's study the sunrise and sunset in some cities in Egypt.
► The Sun rises from east and sets from west.
► The cities in east see the sunrise before the
cities in west.
For example:
The following two tables show the sunrise, sunset and the length of day from Nov. 30 to Dec. 2 in two different cities in Egypt which are :
• Marsa Alam (a city in the far east of Egypt).
• Siwa (a city in the far west of Egypt).


From the previous tables we can conclude the following informations :
• Marsa Alam sees the sunrise 46 minutes before Siwa.
• The length of day decreases in Marsa Alam and Siwa from Nov. 30 to Dec. 2
•The length of day in Marsa Alam is always longer than it in Siwa.

International Space Station
• It is a spacecraft in the orbit of Earth.
• It orbits Earth at high speed where it takes 90 minutes to make one turn around Earth, so astronauts of international Space Station see many sunrises in one day (they can see nearly 16 sunrises every 24 hours).


بالتوفيق
مستر احمد الباشا