Editing 1276: Angular Size
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==Explanation== | ==Explanation== | ||
− | + | Nigge | |
− | + | London's {{w|M25 motorway}} is around 60 km (35 miles) across, a {{w|soccer field}} is about 100 meters long (109 yards), a {{w|Table tennis table|ping pong table}} is 274 centimeters long (9 feet), a {{w|laptop}} is about 35 centimeters across (13.75 inches), the {{w|tilde}} symbol on a keyboard is about 5 millimeters long (197 mils), and a cell of ''{{w|Escherichia coli|E. coli}}'' is about 2 microns long (78.75 millionths of an inch). | |
− | London's {{w|M25 motorway}} is around 60 | ||
A simple {{w|Intercept theorem|formula}} can be used to find the size on earth of a celestial object when the size of or distance to the object is known. This is done by taking the radius of the earth, multiplying by the diameter of the object, and dividing by the distance to the object from the center of the earth. | A simple {{w|Intercept theorem|formula}} can be used to find the size on earth of a celestial object when the size of or distance to the object is known. This is done by taking the radius of the earth, multiplying by the diameter of the object, and dividing by the distance to the object from the center of the earth. | ||
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| rowspan="4"| Panel 1 | | rowspan="4"| Panel 1 | ||
|| {{w|Sun}} | || {{w|Sun}} | ||
− | || 149,600,000 km (9.296×10<sup>7 | + | || 149,600,000 km (9.296×10<sup>7 mi.) |
|| 1,392,684 km (865,373.7 mi.) | || 1,392,684 km (865,373.7 mi.) | ||
|| 59.3 km (36.8 mi.) | || 59.3 km (36.8 mi.) | ||
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|- | |- | ||
|| {{w|Messier 25}} | || {{w|Messier 25}} | ||
− | || 2,100 light-years <br/> 19.867 × 10<sup>15</sup> km (12.158 × 10<sup>15 | + | || 2,100 light-years <br/> 19.867 × 10<sup>15</sup> km (12.158 × 10<sup>15 mi.) |
|| 19 light-years <br/> 179.753 × 10<sup>12</sup> km (111.693 × 10<sup>12</sup> mi.) | || 19 light-years <br/> 179.753 × 10<sup>12</sup> km (111.693 × 10<sup>12</sup> mi.) | ||
|| 57.6 km (35.8 mi.) | || 57.6 km (35.8 mi.) | ||
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| rowspan="6"| Panel 5 | | rowspan="6"| Panel 5 | ||
|| {{w|4942 Munroe}} | || {{w|4942 Munroe}} | ||
− | || 2.2 AU (1.2 AU closest to earth, 179.4 × 10<sup>6 | + | || 2.2 AU (1.2 AU closest to earth, 179.4 × 10<sup>6 km or 111.5 × 10<sup>6</sup> mi.) |
|| 9–10 km (5.6-6.2 mi.) | || 9–10 km (5.6-6.2 mi.) | ||
|| 35.5 cm (14.0 in.) | || 35.5 cm (14.0 in.) | ||
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|| 6.76 µm (266 × 10<sup>−6</sup> in.) | || 6.76 µm (266 × 10<sup>−6</sup> in.) | ||
|} | |} | ||
+ | |||
==Transcript== | ==Transcript== | ||
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A similar model of representing the angular diameter of celestial objects as portions of the Earth's surface seen from its center was described in Isaac Asimov's May 1961 essay "Heaven on Earth". | A similar model of representing the angular diameter of celestial objects as portions of the Earth's surface seen from its center was described in Isaac Asimov's May 1961 essay "Heaven on Earth". | ||
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{{comic discussion}} | {{comic discussion}} |