Where the huge velarium that Nero had stretched across the Colosseum at Rome, that Titan sail of purple on which was represented the starry sky, and Apollo driving a chariot drawn by white, gilt-reined steeds?

尼禄横跨罗马斗兽场天幕，代表空紫色，阿波罗驾驶由镀金缰绳白色骏马牵引战车在哪里？