Hello!! It's Joseph

  中國國家天文 唐代僧一行在《大衍历》中进一步提出“五星盈缩历表”，通过数学模型提高计算精度。这里的所谓“盈”就是加速，“缩”就是减速。 “五星盈缩历表”可以理解为在之前“五星入气加减法”的基础上进行再设计的精密数学模型，这也依赖于当时天文观测仪器的进步。其核心是将行星轨道划分为若干区间，标注各区间内行星的平均日行度与盈缩差。然后是修正参数：通过“损益率”（增减速度的比例）和“躔差”（位置偏差）等参数，动态调整行星的实际位置计算。btw, 現今的通勝也繼續沿用此類計算表，但筆者沒提及當中的演進史。 Synodic period: 在《五星占》的那个时代，1度是被分为240分，因此，“日行八分”就是“三十分之一度（中国古度，合0.9856º）”，约为0.03285º，而今测值约为0.03346º。二者相差无几。 (照估計，“分”是用來作記錄，計算，而非現今儀器角度的刻度） Conceptually wrong/misleading here. The literature五星占 refers to synodic period. These contributed to good record keeping, and  Good observation skills. What type of  instruments( before invention of telescope )used are not mentioned 儀象考成 Present day 1/sidereal period= 1/10755.7=0.0335 degree. But the writer did not elucidate how “日行八分” is derived. And how to find sidereal period from synodic period, or vice versa. Sidereal vs synodic period  Formula （ simple circular orbit) : 何勃亮 網站 Nasa factsheet

澳飾嘉Osiza 燈的部份很好 聲控正常 但 Smartphone app  FanLamp Pro 不能用. Lamp control ok. Fan control not working . Is it copycat clone of Alexa? Remote control ( marking FH-FAN-B) 遙控 DZ款  disassembly pics PCB marking: CC04, 13180 但風扇吵到想死！！！ 6x dB 問題 in here Problem found: the motor has 3 lugs(55,55,75) for positioning to the black vertical mount. Only 2 of lugs can fully, flatly sit on black mount. So the Motor is not sitting properly at right angle to mount!!! Btw， the Motor wirings are fragile. No strain relief at all. Easily tear the wires off the solder joint. I guess the proper connector is missing, to save cost can only say, it's 山寨quality. QC label means nothing. Likely the production line just buy parts from unreliable/ changing sources, who just claim the parts are "standard" and compatible. Which is just talking. Just like the fan lamp controller. Which is actually another version with some feature missing. Cause misleading info to customers. Of course dissatisfied  After repai...

Thunder and rain before the typhoon Wipha approach  Satellite images from FY-4B 18/7 00:00 03:00 05:00 09:00 12:00 15:00 18:00 21:00 19 jul 00:00 Reference  Cma cn Hurricanezone   Digital typhoon japan Detail google map from agora japan in JST(UTC+9)

From Czechia A projector lens, double gauss, aka poorman's biotar fb compare Conversion  to M4/3 Radojuva Allphotolenses Take a spring walk Dpreview MFLenses 70mm f1.4 mflenses   Projector lens design Zemax 

  Wiki Battle of Talas Qarluq Turks 葛羅祿 For five days, the mighty armies clashed. When the Qarluq Turks came in on the Arab side several days into the fighting, the Tang army's doom was sealed. Chinese sources imply that the Qarluqs had been fighting for them, but treacherously switched sides midway through the battle. Arab records, on the other hand, indicate that the Qarluqs were already allied with the Abbasids prior to the conflict. The Arab account seems more likely since the Qarluqs suddenly mounted a surprise attack on the Tang formation from the rear. Some modern Chinese writings about the battle still exhibit a sense of outrage at this perceived betrayal by one of the Tang Empire's minority peoples. Whatever the case, the Qarluq attack signaled the beginning of the end for Kao Hsien-chih's army.