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کلاس پنجم - خط استوا-مدار-نصف النهار
کلاس پنجم
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استوا:

 به دایره بزرگی که دور زمین تصور می کنیم و فاصله ی آن از قطب شمال و جنوب کره ی زمین یکسان است خط استوا می گوییم.

 

مدار :

 به دایره هایی که به موازای خط استوا بر روی کره زمین تصور می کنیم مدار می گوییم .

 

مدار استوا صفر درجه (مدار مبدا) در نظر گرفته شده و مدار ها در نیم کره شمالی و در نیم کره جنوبی بین 0تا 90 درجه تقسیم می شوند .

 

نصف النهار :

 اگر در روی یک کره ی جغرافیایی ، خط های ،(نیم دایره هایی) از قطب شمال تا قطب جنوب ترسیم کنیم به این خطوط نصف النهار می گوییم .

نصف النهار مبدا ( گر ینویچ ، لندن ، مرکزی ) که از رصد خانه ی گرینویچ لندن عبور می کند به عنوان نصف النهار مبدا (صفر درجه ) در نظر گرفته شده است .

نصف النهار های نیم کره شرقی از صفر تا 180 درجه در شرق و نصف النهار ها ی نیم کره غربی بین صفر تا 180 درجه در غرب تغییر می کنند.

مختصات جغرافیایی:

هر نقطه از زمین ، روی یک مدار و یک نصف النهار مشخص قرار دارد که به آن مختصات جغرافیایی آن نقطه می گویند .

 

نمایش حرکت انتقالی زمین





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