On one sunny, Tuesday morning, an old man with a white beard started talking to me while I was watering my flowers.
I'm sorry, but I am busy next Monday and Tuesday.
I got owned in baseball on Tuesday.
This is a day of the week. You know this because it has 曜日 in it. But what day of the week is it? The fire day of the week is the day after the worst day of the week (monday). You set fire to everything because you're so pissed off about yesterday, which makes today Tuesday.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. It will help to know the word 曜日 as well.