Ok,
I am going to renew my nomination from April for:
The Moon and the Sun by Vonda McIntyre https://www.mobileread.com/forums/member.php?u=21734
1997 Nebula Award winner
Set in Versailles, France, in 1693, The Moon and the Sun tells the story of a Marie-Josephe, a lady-in-waiting to the niece of Louis XIV -- the Sun King. Marie-Josephe's brother, Father Yves de la Croix, is a Jesuit and also the King's natural philosopher and explorer. He has brought the King a living sea woman and a dead male, both captured on an ocean voyage. So begins a rich tale of conscience, politics, science, history, and love.
Available at
http://www.vondanmcintyre.com/index-fiction.html
Also... I want to nominate:
Verdant Skies by Steven Jordan
The summary is here:
http://www.stevejordanbooks.com/novels/verdant.htm
BOb