On the Subject of Spangled Stars

I don’t know how to spangle things, and quite frankly I don’t want to know...

This module consists of seven stars arranged in a circle which are flashing a sequence of three to five colors. The colors of the stars correspond to the piano keys C–B. Use the table below to determine which colors correspond to which keys.

If any module on the bomb has “key” in it’s name:	R O Y G B I V F A C E D B G
If the number of Spangled Stars modules on the bomb is even:	R O Y G B I V E B D A F C G
If there are no modules with “Forget” in it’s name on the bomb:	R O Y G B I V C D E F G A B
Otherwise:	R O Y G B I V D C A G B F E

There are also letters next to the stars on the outside of the circle which are encrypted using a Caesar Cipher. To decrypt the letters, you must find the key for the cipher.

To get the key, find the keys of the top 3 stars on the module starting with the star 1 counter-clockwise from 12 o’ clock (X), then 12 o’ clock (Y), and then 1 clockwise from 12 o’ clock (Z). Use the table below to convert the keys of X, Y, and Z to a key for the cipher.

In the table, the “Keys” column refers to the keys of the stars (the order is irrelevant) and “Key” is the key for the Caesar Cipher. Note that you have to subtract this number from the alphabetic position of each letter since you’re decrypting.

Keys	Key	Keys	Key	Keys	Key	Keys	Key	Keys	Key
ABC	24	ACF	22	AFG	22	BDG	13	CEF	14
ABD	19	ACG	13	BCD	5	BEF	7	CEG	1
ABE	12	ADE	25	BCE	1	BEG	14	CFG	24
ABF	25	ADF	7	BCF	10	BFG	11	DEF	12
ABG	14	ADG	13	BCG	18	CDE	9	DEG	22
ACD	3	AEF	20	BDE	6	CDF	14	DFG	13
ACE	11	AEG	25	BDF	22	CDG	6	EFG	10

Notes:

If a star has a ‘#’ next to it then the star does not have a letter to decrypt.

There may also be letters italicized on the inside of the circle, these letters are used when colorblind support is active, do not try and decrypt these letters for this step.