古代天文仪器名。亦称影符。
郭守敬研制成高表以后测影时,横梁的影子,投射在圭面上不十分清楚,这势必影响测量的精确度。为了观测的准确,郭守敬又创制了“景符”。
《元史·天文志》载:“景符之制,以铜叶,博二寸,加长博之二,中穿一窍,若针芥然,以润方为趺,一端设为机轴,可令开阖,稽其一端,使其势斜倚,北高南下,往来迁就于虚梁之中。窍达日光,仅如米许,隐然见横梁于其中。”
景符利用小孔成像原理,使高表横梁所投虚影成为精确实像,清晰地投射在圭面上,达到了人类测影史上的最高精度。
模型需要两颗m3*16螺丝固定转动轴。
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