books measuring distance with light
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# distance measuring device
# distance measuring equipment
# Measure the distance between pixels
# Units of measurement for length and distance
# distance measurements
# Measure the walking distance
# Electronic distance measurement
# Arduino distance measurement
# The distance that light travels
# Similarity and distance metrics
# distance scale in astronomy
# The distance between us is a martyr
# determination distance
# Distance estimate
# long distance connection
# distance decay
# angular distance
# average distance between particles
# distance factor
# zero distance
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Source: wikipedia.org
قياس المسافة بالضياء (Info)
إذا كان ضياء جرم فلكي بعيد معروفا نستطيع حساب بعده عنا بقياس فيضه (أي جزء ضيائه الذي يصلنا ونقوم بتسجيله) ،ثم نعين . هذه القيمة هامة لقياس شمعة عيارية كونية مثل مستعر أعظم، نوع 1أ ، وتلك هي التي استخدمت في اكتشاف تمدد الكون .
