**5. Conclusions**

To conclude, we would like to highlight once again that cultural astronomy is thus a discipline with a sustainable methodology that helps identifying new heritage or provides new value to already existing heritage or, finally, helps identify heritage at risk.

As a relatively new discipline, cultural astronomy accumulates new observations and points of view on different geographic areas, historic periods and subjects. Cultural astronomy allows us to grasp the worldview of past and ancient societies. Besides, it gives new sense to the archaeological and cultural heritage.

A further point that should be mentionehere is that cultural astronomy has a clear social educative value both to present the value of astronomy in ancient societies [51] or for actually teaching astronomy to present day students [52].

Finally, and as far as it engages with society to promote new initiatives, we can ensure the sustainability of the research. However, cultural astronomy also makes society aware of the importance of the sky for our past. Hence, it can help in promoting a sustainable use of the sky, for instance by promoting the use of particular luminaries at heritage sites where the sky is important for the apprehension of the past intent of the builders of ancient sites. The Starlight Initiative [53], and its strong cultural aspects, would be a good example of this.

**Author Contributions:** Conceptualization, A.C.G.-G. and J.A.B.; Writing—original draft preparation, A.C.G.-G. and J.A.B.; Writing—review and editing, A.C.G.-G. and J.A.B.

**Funding:** This work was partially supported by the projects P/310793 'Arqueoastronomía' of the IAC, and AYA2015-66787 'Orientatio ad Sidera IV' of the Spanish MICIU.

**Acknowledgments:** We would like to thank Prof. Ioannis Liritzis for the invitation to produce this work. The authors would especially like to thank Gianfranco Costa, Cipriano Marín and the Gran Canaria Council for some of the beautiful images illustrating this paper

**Conflicts of Interest:** The authors declare no conflict of interest.
