The moon has thousands of features we can look at with binoculars or a telescope, but so much choice makes it hard to know where to begin.
Even if you regularly observe the lunar surface, the chances are you're missing the best views because either you don't know what to look for, or you don't know the name of the feature you're seeing.
To help us overcome these problems, Sky & Telescope Magazine created a challenge called The Lunar 100.
This famous list of 100 lunar features ranges from the easy to find to the incredibly difficult. It includes craters which can only be seen with a telescope and features that are only visible now and again thanks to the moon's 'wobble'.
You may have seen the moon a thousand times or more, but you've never enjoyed it like you will do when hunting for the Lunar 100.
It feels great to have spotted all one hundred stunning features but, sadly, finding every last one is...
The Lunar 100 is designed to be both easy to begin and incredibly challenging to complete.
If you know where to look, the first ten sites on the list can be found with good eyesight, and many more are not too tricky with just a small pair of binoculars.
However, as you move towards the 100th target, the challenges become harder.
The craters become smaller and many of the features can only be seen easily on two or three nights of the lunar cycle. To capture these, you need the detailed information that makes them easier to find.
But, just when you think you have the list tamed...
We come to the real stinkers!
Items 80 onwards are a collection of diabolical quests.
Craters so small you'll need a good scope, great viewing and a quality guide to show you the way.
Heck, some of the craters are only visible when the moon librates! This is the small wobble that shows us some of the 'dark side' of the moon now and again.
The best way to spot all 100 lunar features is with a great guide in hand!
Along with our sister site, Love the Night Sky, our mission is To Make Astronomy Accessible to Everyone.
With our complete, 3-part Lunar 100 guide, no matter if you're a complete novice or a practiced moon-watcher, you'll be finding and recording every single one of the Lunar 100 in no time at all.
If the sky is clear tonight, and you have our guide in hand, you'll have recorded your first features by the morning!
In this great value guide, you get three separate packs to help you discover everything about the moon that you can think of.
Pack 1 - Lunar 100 Finder List: The complete list of all 100 lunar features, including what they are, where to find them and the best night of the moon's cycle to look for them.
To give you the best chance of success, we've split the 28 day lunar cycle into 10 separate phases. Each phase covers just three days of the lunar cycle, so you can pinpoint exactly when the features you're looking for will be visible.
Pack 2 - Moon Locator Charts: Using superb pictures of the moon from NASA, these charts show you in detail the location of every single one of the Lunar 100 features.
Not only that, but each feature is shown on the best lunar phase to see it! No more wasting time looking for features buried in darkness or in so much glare they can't be enjoyed.
With this pack alone, you'll be sure to see each of the Lunar 100 features only when you have the best chance of finding it and when its looking its very best!
Pack 3 - Lunar 100 Checklist: A complete checklist which you can personalise as you discover the Lunar 100 from the comfort of your own backyard.
This specially designed pack lets you record your Lunar 100 spotting achievements. For each individual feature, make a note of when, where and how you saw it. When you've done, you'll have a complete record you can share with astronomy club friends or refer to time and again in the future.
The Complete Guide to the Lunar 100 is available for immediate download for just $4.99.
To grab your copy straight away, just click the button below, enter your details and download all three packs immediately.
If tonight presents clear skies, you'll be able to make a start on your Lunar 100 voyage of discovery!