If you want to receive the moon Snapchat trophy you have to send 50 Snaps while in night mode. Unfortunately, there are a number of Snapchat users that do not have this option because of their phone. To my knowledge, unless you have an iPhone 6 or newer you do not have the “night mode” option on your Snapchat app. That means if you are using any type of Android or an iPhone 5s, 5, 4s or 4 you will not be able to get this trophy.
I also understand that almost all versions of the iPod do not have this feature either. This is very unfortunate as I know a number of people want to get all the Snapchat trophies so their trophy case looks like this:
Unless something changes in the near future you will likely not be able to get this trophy on your Android or older model iPhone. One work around is to sign in to your account on someone else’s iPhone 6 or 6s and quickly send 50 snaps using night mode. This won’t take very long so ask your friends that have the newer model iPhone if you can sign in to your Snapchat on their device for 30 minutes. This will allow you to achieve the moon trophy.
Remember that new Snapchat trophies will likely come out very soon.