Sweetie Belle discovers an amateur novel lying abandoned on the ground. The mysterious story soon becomes all the rage with everypony.

And then Rarity hears a passage of it being read out loud...

This story is a sequel to How Not To Use Your Royal Prerogative

  In an Equestria where the Sonic Rainboom never happened, Sunset Shimmer is the prized pupil of the Princess of the Sun. As Sunset struggles to make up for her past misdeeds and come to terms with the pony she wants to be, Celestia sends her to find the classic work The Application of Unified Harmony Magic from the Royal Canterlot Archives.
  Right after lunch, some meddling by her friends and meeting somepony with firsthoof experience of the Sunset she used to be.

Featured on Equestria Daily on August 18, 2016!
Appeared in the FimFiction Featured Box!

Cast: Sunset Shimmer, Moon Dancer, Minuette, Twilight Sparkle & Princess Celestia

Stories set in the Wavelengths Timeline in chronological order:

Origins Arc
The Alchemy of Chemistry
Bards of the Badlands
Grading on a Bell Curve
Habits of the Equestrian Phoenix
How Not To Use Your Royal Prerogative

Applications Arc
The Application of Unified Harmony Magics
Princess Celestia: A Brief History
The Cloudsdale Report

Dreamers Arc
Tactics of Snowbound Unicorns
A Study in Chaos Theory
Teahouses of Saddle Arabia
As the Raven Flies

Cover Credits
Cover Design by Amber Spark
Sunset Shimmer Vector by TigerBeetle
Pony SciTwi Vector by Osipush
Canterlot Bookshelves Vector by FavoriteArtMan
Sunset Shimmer Cutie Mark by MillennialDan

Beta Reader Credits
Ebon Quill - Worldbuilding Writer on The Manehattan Project
Quantum State - Technical Director of The Manehattan Project
The Albinocorn - Master of Sunset Shimmer Stories

Strongly Recommended Stories:
The Brightest and the Best by Pineta - The events in this story are considered to be completely canon to this timeline and explain Twilight's entrance exam to Celestia's School for Gifted Unicorns. I cannot recommend this story enough.
MLP Annual 2013 - "The Fall of Sunset Shimmer" - As above, the 8-page short comic in the beginning of the Annual is also considered to be canon, though with some major variations.

Version 3.0 Edit: Extensive grammatical and mechanics changes. Adjustment to timeline of Sunset's second mirror experience.

Princess Twilight Sparkle is a teacher, a ruler, and the occasional savior of Equestria, and she loves it. Her jobs can be rewarding and fulfilling, but they can also be a bit exhausting. Hearing her friend is feeling a little worn out from all the responsibilities she has, Sunset Shimmer offers Twilight a holiday together across the portal in the human world. No evil magic, no intramural sports, and no one else. Just the two of them spending the entire day together.

Original art by Uotapo
Cover text generously added by Novel Idea

First story in the Rays of SunLight series.

Twilight starts to viciously attack Rarity with snuggles one fine, seemingly-normal morning. Cuteness and an extremely confused Rarity marshmallow follows.

Edited by thegamerator10 and Harmony Pie

{First 7 comments deleted accidentally}

If there was something that broke Rarity's heart more than seeing her best friend getting stood up, it was seeing Twilight go back to the library with a matching broken heart.

Luckily for Twilight, Rarity would be damned if she let that happen.

A year has passed since the fateful night - and day - of Luna's return. Regret and insecurity plague her still, but slowly and surely, she is getting better. A sister's love proves itself a treasure in trying times.

Patience, forbearance and a sense of humour to brighten dark moods help, too.

Cover art borrowed lovingly from Silfoe, on Derpibooru.
Here's the artist's tumblr, too: The Royal Sketchbook

Sunset was enjoying her day, going through school as she was expected to do, when she's suddenly called to the Principal's office.

Confused, but with little choice in the matter, she answers, heading to Celestia's office. There, she finds the Principal sitting, wanting to have a chat.

Sunset was not prepared for anything like this.

Now with Youtube reading!

Sunset has a crush on Twilight. The problem is, she seems to have a type: people who are incredibly powerful, have some measure of authority and power in their positions, and still have very sweet personalities.

And Twilight is far more powerful and popular than Flash ever was.

But it's okay. It's not like Twilight likes her back, right? Right.

7/7/2016: Now with cover art designed by the very generous Novel-Idea! Thank you so much!

The greatest trick the Great and Powerful Trixie ever performed was convincing all of ponykind that she was only ever a mere unicorn.

Years later, Princess Celestia and Trixie have a discussion by Twilight Sparkle's grave.

Inspired by the cover art, drawn by crenaiir. Not canon to Season 6 ending and post-Season 6.

Fuchsia and Lavender lend Rarity a hand with the new uniforms for the Friendship Games.

Cover art by RadiantRealm.