Introduction:
India's acceptance of her full membership of the Commonwealth of Nations can be seen as an extra constitutional declaration due to various reasons. The Commonwealth is an intergovernmental organization of countries that were formerly part of the British Empire, and its membership is voluntary. India's decision to join the Commonwealth after becoming a republic and adopting its own constitution can be seen as a symbolic gesture and a reflection of its commitment to shared values and principles with other member nations.

Historical Context:
- India's independence from British rule in 1947 marked the end of colonial rule and the beginning of a new era for the country.
- As a newly independent nation, India adopted a republican form of government with its own constitution, which came into effect on January 26, 1950.
- The decision to become a republic meant severing formal ties with the British monarchy and establishing India as a sovereign nation.

India's Relationship with the Commonwealth:
- Despite becoming a republic, India maintained a close relationship with the Commonwealth and continued to participate in its activities.
- India participated in the first Commonwealth Heads of Government Meeting (CHOGM) in 1971 as a guest, and subsequently became a full member in 1977.
- India's acceptance of full membership in the Commonwealth was a voluntary decision, demonstrating its commitment to the principles and values shared by member nations.

Extra Constitutional Declaration:
- The Indian Constitution does not explicitly mention membership of the Commonwealth or any specific requirements for joining international organizations.
- The decision to become a member of the Commonwealth was made through executive action by the government, without the need for any constitutional amendments or parliamentary approval.
- By accepting full membership, India reaffirmed its commitment to the Commonwealth's principles of democracy, human rights, and the rule of law, which are in line with the values enshrined in the Indian Constitution.

Symbolic Gesture:
- India's acceptance of membership can be seen as a symbolic gesture to acknowledge the historical and cultural ties with other Commonwealth countries.
- It also reflects India's desire to engage with the international community and strengthen its global standing.
- The Commonwealth provides a platform for India to collaborate with other member nations on various issues of mutual interest, such as trade, development, and diplomacy.

Conclusion:
India's acceptance of full membership in the Commonwealth of Nations can be considered an extra constitutional declaration due to its voluntary nature and the absence of specific constitutional provisions regarding membership. It highlights India's commitment to shared values and principles with other member nations, while also providing a platform for diplomatic engagement and cooperation on a global scale.