Air:
Nearest airport to ARIES is Pantnagar , around 60 km from Nainital. The airport is well connected with IGI New Delhi and Dehradun through national carriers like air-india etc.
Other nearest airport is Lucknow, which is well connected to major indian cities.

Rail:
Kathgodam (~35 km from Nainital) and Lal Kuan (~55 km from Nainital) are the nearest railway stations for Nainital. Some of the important train connections from Kathgodam:
1. Ranikhet Express (Jaisalmer - Jaipur - Delhi - Kathgodam) - daily
2. Sampark Kranti Express (Delhi-Kathgodam) - daily
3. ANVT KGM Shatabadi Exp(Anand-Vihar, Delhi - Kathgodam) - daily
4. Bagh Express (Howrah - Gorakhpur - Lucknow - Kathgodam) - daily
5. Lucknow - Kathgodam Express (Lucknow - Kathgodam) Sun-Wed-Thu from Lucknow
6. Agra - Ramnagar Express (Agra - Mathura- Bareilly - Lal Kuan) Weekly (Wed)

Road:
Nainital is connected by road to major centers of northern India, some of the major road distances are: Agra - 379 km. , Delhi - 277 km. and Bareilly - 141 km.

Tip for using taxi from Kathgodam-ARIES:
Once you reach at Kathgodam railways station, you can also take taxi to ARIES, which taxi drivers usually know as Observatory. For ARIES, there is bifurcation road on Kathgodam-Nainital high way, 6 km before reaching Nainital. The bifurcation road is about 3km, because of which, some time taxi driver charge Rs 25-50 extra for Kathgodam-ARIES as compare to Kathgodam-Nainital. The typical share basis taxi fair may be around Rs 100-150 per seat, and full taxi may cost around Rs 500-700 (also highly vary depending on the number of tourist visiting Nainital).

ARIES Bus:
Institute bus service is also available from Nainital bus stand to ARIES, the bus timings are 8.30 AM, 9.40 AM, 1:00 PM, 2:30 PM, 4:00 pm and 7:00 pm and similarly from ARIES to Nainital at 9.00AM, 11:30AM, 2:00PM, 3:30PM and 5:30 pm.