I promise this page will grow as I reread the books. For now, Dragonsdawn information.
Pern was colonized some 200 years after the survey team reported in fit for habitation.
Eight years after Landing, Thread arrived.
The Red Star has a two hundred year eccentric orbit. (DD 173)
The first dragon hatched was bronze Polenth, who Impressed to David Catarel. (DD 267)
The first gold Impressed to Tarrie Chernoff. (DD 267)
Dragons were bio engineered to Impress male to male and female to female. (DD 269)
Descriptions of fire-lizards (dragonets) - DD 102
Description of the first dragons - DD 266-267
Speerleek and whitebulbs can be added to food (in this case, stew) to promote general health and prevent illness. (M 65)
Winter Solstice is considered a holiday and a reason for an outing. (M 10)
Dragonriders do practice their former Crafts - at least during Intervals. (M 238)
Pern does have months! See the 'Some terms of interest' section of Moreta (and the other novels, I'd assume). It defines a 'month' as 'four sevendays.'
Healer-type Facts
Sweatroot is used to help sweat a fever out. (M 68)
Willowsalic is used in small crystals (then usually made into tea). (M 68)
An infusion of featherfern is also used to reduce fever. (M 68)
Aconite, a powdered root, is used for reducing heart palpitations, and is considered a strong drug. (M 68,89)
Whitethorn, adonis, glovecap, and tansy are other herbs used to reduce heart palpitations. (M 89)
Tussilago, comfrey, hyssop, thymus, ezob, and borrago are used for coughs. (M 70)
Influenza didn't kill the Perneses - secondary infections such as pneumonia and other respitory infections did. (M 87)
Pernese do get colds! (M 137)
Fellis is given every 4 hours. (M 68)
Fellis juice is bitter. (M 120)
Some diseases on Pern include typhus, typhoid, diptheria, and scalatina (scarlet fever). (M 145-146)
Numbweed is used in wine, along with fellis and a 'euphoric' to make Moreta feel 'disembodied' and to sleep. (M 154)
The only two places needlethorn grows on the Northern continent are at Ista and Nerat. (M 233)
DD - Dragonsdawn
DSg - Dragonsong
DSr - Dragonsinger
DDr - Dragondrums
DF - Dragonflight
DQ - Dragonquest
WD - The White Dragon
M - Moreta: Dragonlady of Pern
NS - Nerilka's Story
RP - The Renegades of Pern
ATW - All the Weyrs of Pern
FF - Chronicles of Pern: First Fall
DP - The Dolphins of Pern
DE - Dragonseye/Red Star Rising
MH - Master Harper of Pern