Comments on: Tiananmen Fireworks and CCTV broadcast delay http://www.utilitycomputing.com.cn/china/tiananmen-fireworks-and-cctv-broadcast-delay 数 据 嘉 年 华 Tue, 17 Aug 2010 15:47:12 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: richard http://www.utilitycomputing.com.cn/china/tiananmen-fireworks-and-cctv-broadcast-delay/comment-page-1#comment-6795 richard Tue, 13 Oct 2009 17:08:19 +0000 http://www.utilitycomputing.com.cn/?p=351#comment-6795 I guess I am about 500 metres north of Si Hui. Right on the corner of the 4th Ring Road and Chaoyang Lu... I guess I am about 500 metres north of Si Hui. Right on the corner of the 4th Ring Road and Chaoyang Lu…

]]> By: richard http://www.utilitycomputing.com.cn/china/tiananmen-fireworks-and-cctv-broadcast-delay/comment-page-1#comment-6792 richard Tue, 13 Oct 2009 02:43:10 +0000 http://www.utilitycomputing.com.cn/?p=351#comment-6792 Yes Ci yun Si.. always get back to front.... 25 seconds... that seems a bit long? I was thinking 3-5 or so....? Yes Ci yun Si.. always get back to front…. 25 seconds… that seems a bit long? I was thinking 3-5 or so….?

]]> By: ibz http://www.utilitycomputing.com.cn/china/tiananmen-fireworks-and-cctv-broadcast-delay/comment-page-1#comment-6786 ibz Sun, 11 Oct 2009 14:09:03 +0000 http://www.utilitycomputing.com.cn/?p=351#comment-6786 Assuming you mean "ci *yun* si" (慈云寺), which is a bit north of Sihui, doing a quick measurement on Google Earth yields 8.35 km from Tian'anmen. Speed of sound is 343 m/s at 20 °C (according to http://en.wikipedia.org/wiki/Speed_of_sound ; I assume the temperature at that time was not too far from 20). That gives me 8350 m / 343 m/s = 24.3 s. Not sure how the tall buildings in the CBD (which are in the way between the two points) affected the speed of sound, but I guess not much in terms of speed (they might divert it, but not so much slow it down). So I would guess their delay is somewhere between around 25 seconds. Nice problem. :) Assuming you mean “ci *yun* si” (慈云寺), which is a bit north of Sihui, doing a quick measurement on Google Earth yields 8.35 km from Tian’anmen. Speed of sound is 343 m/s at 20 °C (according to http://en.wikipedia.org/wiki/Speed_of_sound ; I assume the temperature at that time was not too far from 20). That gives me 8350 m / 343 m/s = 24.3 s.
Not sure how the tall buildings in the CBD (which are in the way between the two points) affected the speed of sound, but I guess not much in terms of speed (they might divert it, but not so much slow it down).

So I would guess their delay is somewhere between around 25 seconds.

Nice problem. :)

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