Sagittarius: Buy them something they like as a peace offering, and always be sincere.
They can see right through you.
Give them space, let them cool down, then go and talk to them.

God & Man
Taurus
Stop making everything an argument because they wont stop until they get the last word.
Just let it go.
Gemini
God help you if youve somehow managed to anger a Gemini.
Apologize (repeatedly in 6 languages) and do something nice for them.
Its going to take some work to undo their anger.
Cancer
Do not cushion your argument with insults against them.
It only hurts them more.
Apologize, apologize, apologize, and tell them how much you love them.
Their soft-spirit makes it very hard for them to be angry.
Leo
Dont be condescending to them.
Hear them out, let them speak, and venture to make amends by being nice to them.
You will have to be the one to diffuse their anger.
Virgo
Just be sincere when you apologize.
Generally, Virgos are pretty understanding.
Libra
Wow, um, good luck?
They dont forget, and they will not be burned a second time.
Sagittarius
Buy them something they like as a peace offering, and always be sincere.
They can see right through you.
Capricorn
Definitely give them some time to blow off some steam before hand.
After that, you should be able to sit down and reasonably talk things out.
Aquarius
They wont be mad for long, honestly.
Just apologize, mean it, and if theyre still upset, give them time alone.