Satish Dhawan Space Centre, Sriharikota

The Satish Dhawan Space Centre (SDSC SHAR) is the operational spaceport of the Indian Space Research Organisation (ISRO), located on Sriharikota, a spindle-shaped barrier island on the Bay of Bengal coast of Andhra Pradesh, roughly 80 kilometres north of Chennai. The Government of India selected Sriharikota Range (SHAR) in 1969 after a survey identified the island's proximity to the geographic equator, its low population density, and an unobstructed eastward sea corridor as ideal for rocketry. The first sounding rocket flew from the range on 9 October 1971. The facility was renamed the Satish Dhawan Space Centre in September 2002, honouring Satish Dhawan, the third Chairman of ISRO (1972–1984), who presided over the development of indigenous launch-vehicle capability. The centre functions under the Department of Space, the apex civil-space organ that reports directly to the Prime Minister, and is the only Indian facility licensed to conduct orbital launches.

Operationally, SDSC SHAR is responsible for the full launch campaign downstream of vehicle and payload arrival. The centre houses solid-propellant processing plants where the large solid motors of the PSLV and LVM3 are cast and integrated, a Solid Propellant Space Booster Plant (SPROB), and a Propellant Production Plant. Spacecraft and stages arrive from ISRO units such as the Vikram Sarabhai Space Centre at Thiruvananthapuram and the U R Rao Satellite Centre at Bengaluru, where they undergo final assembly, integration and testing. The launch sequence is governed by a Mission Readiness Review and a Launch Authorisation Board that clears the countdown; range safety officers monitor trajectory and retain destruct authority. Telemetry, tracking and command are handled through the centre's radar, telemetry stations and the Mission Control Centre, supported by ISRO's wider ground network.

The centre operates two functional orbital complexes. The First Launch Pad (FLP), commissioned in 1993, and the Second Launch Pad (SLP), commissioned in 2005, both support the Polar Satellite Launch Vehicle (PSLV), the Geosynchronous Satellite Launch Vehicle (GSLV) and the LVM3 (formerly GSLV Mk III). The SLP introduced an Integrated Assembly Building permitting vehicle integration on a mobile launch pedestal away from the pad, reducing pad-occupancy time. A Vehicle Assembly Building and a Second Vehicle Assembly Building further support parallel integration. A Third Launch Pad has been sanctioned to support the heavier Next Generation Launch Vehicle and human-spaceflight requirements. A separate facility for small launch vehicles has also been developed to accommodate the commercial smallsat market.

Historic and contemporary missions trace the centre's significance. Chandrayaan-1 lifted off from the SLP on 22 October 2008; the Mars Orbiter Mission (Mangalyaan) launched aboard a PSLV-XL on 5 November 2013; Chandrayaan-3 launched on an LVM3 on 14 July 2023, leading to the soft landing of the Vikram lander near the lunar south pole on 23 August 2023. The record PSLV-C37 mission of 15 February 2017 placed 104 satellites in orbit in a single flight. The Aditya-L1 solar observatory launched on 2 September 2023. SDSC SHAR is also the designated launch site for the Gaganyaan human-spaceflight programme, with the SLP being modified for crew-rated operations and a crew-escape and access infrastructure under construction.

SDSC SHAR should be distinguished from adjacent ISRO entities. It is a launch and range facility, not a vehicle-design centre; rocket stages are developed at the Vikram Sarabhai Space Centre (VSSC) in Thiruvananthapuram, while liquid-propulsion systems originate at the Liquid Propulsion Systems Centre. It is distinct from the Thumba Equatorial Rocket Launching Station (TERLS) near Thiruvananthapuram, India's first launch site, which since the late 1960s has been used for sub-orbital sounding-rocket research rather than orbital missions. SDSC SHAR is also separate from the Master Control Facility at Hassan and Bhopal, which manages spacecraft once on orbit, and from NewSpace India Limited (NSIL), the commercial arm that markets launch services.

Several developments and constraints shape the centre's trajectory. Eastward launches over the Bay of Bengal serve most orbital inclinations, but launches to high-inclination or polar orbits historically required a dog-leg manoeuvre to avoid overflying Sri Lanka, which imposed a payload penalty; ISRO has used trajectory adjustments to mitigate this. To diversify launch geography and ease range congestion, the Department of Space has been developing a second spaceport at Kulasekarapattinam in Tamil Nadu, intended principally for southward small-satellite launches into polar orbits. Sriharikota's location within the Pulicat Lake ecosystem also makes environmental management and the periodic resettlement and rehabilitation of local communities a recurring administrative consideration. Cyclonic weather over the Bay of Bengal occasionally drives launch-window decisions.

For the working practitioner, SDSC SHAR is the single point through which India's entire orbital-access capability is exercised, making it a node of strategic, scientific and commercial consequence. Civil-services candidates encounter it under science-and-technology and infrastructure themes, where it illustrates indigenous self-reliance, the institutional architecture of the Department of Space, and the geography of launch operations. For diplomats and analysts tracking India's space posture, the centre's expansion toward human spaceflight, heavy-lift vehicles and commercial smallsat launches signals New Delhi's intent to convert technical capability into geopolitical and economic leverage in an increasingly contested domain. Its capacity, redundancy through two pads, and planned third pad together determine the cadence at which India can field civil, scientific and dual-use space assets.