# Cúpula da Luneta Equatorial 21, Brazil: what it is and when to go > Cúpula da Luneta Equatorial 21 is an observatory in Brazil (Rio de Janeiro). Interests: Stargazing. The best time to visit is all year round. In December there are 13 h 24 of daylight, and in June, 10 h 36. Here is what it is, where it lies, when to come, how to get there and what else is nearby to turn it into a trip. - Address: https://kokai.app/en/paises/america/brasil/cupula-da-luneta-equatorial-21/ - Reviewed on: 2026-10-08 - Language: en ## In a nutshell - **What it is:** Observatory · Stargazing - **Where:** Brazil - **You can go:** All year round. - **Nearest airport:** GIG Rio De Janeiro, 10.0 km as the crow flies - **Run by:** MAST - **Coordinates:** -22.89621, -43.2239 ## What it is and where Cúpula da Luneta Equatorial 21 is an observatory in Brazil (Rio de Janeiro). Concluído em 1916, seu propósito era abrigar a luneta de 33cm, encomendada por D. Pedro II. O instrumento nunca foi montado e, em seu lugar, foi instalada a Luneta Equatorial 21. Objetiva: 21cm | Fabricante: Gustav Heyde, Alemanha (início do séc. XX). It is in [Rio de Janeiro](https://kokai.app/en/paises/america/brasil/rio-de-janeiro/), where this site lists 62 more places to see, 3.0 km from the centre. Its coordinates are -22.89621, -43.2239; the nearest main airport is Rio de Janeiro Galeão – Tom Jobim International Airport (GIG, Rio De Janeiro), 10.0 km as the crow flies. How to get around Brazil (train, car, bus) is covered in [its country guide](https://kokai.app/en/paises/america/brasil/#moverse). - [Where it is](https://www.google.com/maps/search/?api=1&query=-22.896212%2C-43.223904) - [Directions](https://www.google.com/maps/dir/?api=1&destination=-22.896212%2C-43.223904) - **Run by:** MAST It is one of the [Stargazing](https://kokai.app/en/paises/america/brasil/estrellas/) places in Brazil. In [Kokai](https://kokai.app/en/) it is already on your trip map next to the places you save yourself, and it goes into a day's plan with one tap. ## When to go Months when you can visit Cúpula da Luneta Equatorial 21: **all year round**. | Mes | Época | Hours of daylight | | --- | --- | --- | | January | Possible | 13 h 16 | | February | Possible | 12 h 46 | | March | Possible | 12 h 10 | | April | Possible | 11 h 28 | | May | Possible | 10 h 54 | | June | Possible | 10 h 36 | | July | Possible | 10 h 43 | | August | Possible | 11 h 12 | | September | Possible | 11 h 53 | | October | Possible | 12 h 33 | | November | Possible | 13 h 07 | | December | Possible | 13 h 24 | In December there are 13 h 24 of daylight, and in June, 10 h 36. Daylight hours are calculated from the site's latitude for the 15th of each month; when planning a full day on foot they matter as much as the weather. When to go to Brazil in general, with its festivals and peak seasons, is in [its country guide](https://kokai.app/en/paises/america/brasil/#cuando-ir). ## Before you go to Brazil To enter Brazil there are 9 things to sort out before you leave, starting with “Passport valid for six months”: they are all, with their deadlines, in [the Brazil checklist](https://kokai.app/en/paises/america/brasil/#antes-de-salir). Currency: Brazilian real (BRL); plugs: Type N and C · 127 V and 220 V depending on the region · 60 Hz (you need an adapter and should check the voltage); emergencies: 190 police · 192 ambulance · 193 fire brigade. In [Kokai](https://kokai.app/en/) you tick off the checklist inside your trip, and each item reminds you when it is time to do it. ## What is nearby - [Astrolábio](https://kokai.app/en/paises/america/brasil/astrolabio/): Observatory · 18 m - [Cúpula da Luneta Equatorial 32](https://kokai.app/en/paises/america/brasil/cupula-da-luneta-equatorial-32/): Observatory · 24 m - [Cúpula da Luneta Foto-equatorial](https://kokai.app/en/paises/america/brasil/cupula-da-luneta-foto-equatorial/): Observatory · 42 m - [Cúpula da Luneta Equatorial 46](https://kokai.app/en/paises/america/brasil/cupula-da-luneta-equatorial-46/): Observatory · 45 m - [Pavilhão Círculo Meridiano de Gautier](https://kokai.app/en/paises/america/brasil/pavilhao-circulo-meridiano-de-gautier/): Observatory · 46 m Distances are as the crow flies. Everything else is in [the Brazil guide](https://kokai.app/en/paises/america/brasil/). ## More in Brazil: Stargazing - [Malakoff Tower](https://kokai.app/en/paises/america/brasil/malakoff-tower/): tower in Recife, Brazil - [Pierre Kaufmann Radio Observatory](https://kokai.app/en/paises/america/brasil/radiobservatorio-do-itapetinga/): Observatory - [Observatório Municipal de Campinas Jean Nicolini](https://kokai.app/en/paises/america/brasil/observatorio-municipal-de-campinas-jean-nicolini/): astronomical observatory - [Brasília Planetarium](https://kokai.app/en/paises/america/brasil/planetario-de-brasilia-luiz-cruls/): museum in Brasília, Distrito Federal - [Carmo Planetarium](https://kokai.app/en/paises/america/brasil/planetario-do-carmo/): Planetarium in Brazil - [Professor Aristóteles Orsini Planetarium](https://kokai.app/en/paises/america/brasil/planetario-profesor-aristoteles-orsini/): planetarium in Brazil Every Brazil place under Stargazing, each with its season, is on [its page](https://kokai.app/en/paises/america/brasil/estrellas/). ## Frequently asked questions ### What is Cúpula da Luneta Equatorial 21? It is an observatory in Brazil. ### When is the best time to visit Cúpula da Luneta Equatorial 21? All year round. In December there are 13 h 24 of daylight, and in June, 10 h 36. ### How do you get to Cúpula da Luneta Equatorial 21? The nearest main airport is Rio de Janeiro Galeão – Tom Jobim International Airport (GIG), 10.0 km as the crow flies. From there, [directions](https://www.google.com/maps/dir/?api=1&destination=-22.896212%2C-43.223904) opens the route on the map, and how to get around Brazil is explained in [its country guide](https://kokai.app/en/paises/america/brasil/#moverse). ### How do I add it to my trip? With one tap. In Kokai it is already on the Brazil map, next to the places you save yourself: add it to a day's plan, give it a time and, if you like, get a reminder when you pass nearby. ### What else is around here? Nearby you have [Astrolábio](https://kokai.app/en/paises/america/brasil/astrolabio/), [Cúpula da Luneta Equatorial 32](https://kokai.app/en/paises/america/brasil/cupula-da-luneta-equatorial-32/), [Cúpula da Luneta Foto-equatorial](https://kokai.app/en/paises/america/brasil/cupula-da-luneta-foto-equatorial/). The rest is in [the Brazil guide](https://kokai.app/en/paises/america/brasil/). Data from [OpenStreetMap](https://www.openstreetmap.org/way/694827986), licensed under the ODbL, and from [Wikidata](https://www.wikidata.org/), CC0. Daylight hours are calculated from the latitude. More in [credits](https://kokai.app/en/aviso/#creditos).