OK, in light of nabaxo's comment, this is a draft of what will be sent to Sirius. If anyone has comments, I definitely want to hear them.
Just remember that the number of years that pass per-turn changes in 1000 AD from 20 to 10 and then again in 1500 AD from 10 to 5. (See this link for details: http://forums.civfanatics.com/showthread.php?t=202516) So that means that a NAP until 1500 AD will mean 50 turns of NAP.

Thoughts?Greetings to Our Friends and Allies of the Sirius Business:
We are happy to hear that our friends are willing to extend our special relationship, formalized in the SAP. Although our treaty is not actually expiring (as it continues indefinitely until canceled), the period where cancelation is not permitted ends soon. We wish to extend this period as do you. However, our Goddesses prefer a slightly simpler method of doing so.
Here are the relevant sections of the treaty for reference:We appreciate and agree with the spirit of your suggestions for the extension of the Non Aggression Pact, however, the Zenobians wish to avoid overly complex redoundancies in our agreements because complexities often offend the Goddesses. Our Goddesses do not understand why an extended Non-Aggression clause is necessary on a base Non-Aggression period... "Why not just make the base period longer?" is what they say to us...Spoiler :Section 2. Pact Duration and Cancellation Terms
2.1. The pact continues indefinitely until it is canceled.
2.2. The pact cannot be canceled until 1000AD.
...
Section 3. Non Aggression
3.1. Both members agree not to attack each other at any time while this pact is in effect.
...
3.4. If the pact is canceled because there are no non-member teams left in the game (Section 2.3) a Non-Aggression Pact will go into effect that will last for 10 turns after the last non-member team is eliminated.
Therefore, to appease our Goddesses, we invite the Sirians to decide which type of NAP we will have to augment our larger treaty. We can add set a term of years to our NAP, giving us occasion, many years from now, to revisit our treaty, as we are doing now. On the other hand, we can instead adopt a standing obligation to give prior turns notice of cancelation. We would enjoy either type of NAP equally, so it is up to the wise Sirians to choose which best suits them.
Accordingly, and under Section 10.2 of the SAP:We submit the following proposed amendments to section 2.2 of the SAP and request that our friends in the Sirian Business choose the one that suits them best. The one that Sirius chooses will immediately replace the current Section 2.2, and thus become part of the SAP treaty.Spoiler :Section 10. Amendments
10.1. A proposed amendment may be submitted by either member.
10.2. A proposed amendment will be adopted upon agreement of both members.
Here are our proposed amendments for Sirius to choose from:
Choice 1:2.2. The pact cannot be canceled until 1500AD.
or
Choice 2:We look forward to the Sirians decision. May our mighty Alliance continue to dominate Starland and beyond.2.2. The pact cannot be canceled except with 10 turns prior written notice via team gmail and PM to the most recent turnplayer.
nabaxo, Special Envoy to Sirius